The net ionic equation for the reaction between permanganate and tin(II) is[tex]5Sn^{2+} + 2MnO_{4} ^{-} + 16H^{+} 5Sn^{4+} + 2Mn^{2+} + 8H_{2} O[/tex] and the standard potential is +1.34 V.
What is net ionic equation?
A net ionic equation is defined as an equation that only represents the ions or molecules that are actively involved in the reaction or those that change.
Explanation:
[tex]MnO_{4} ^{-} + Sn^{2+}[/tex] → [tex]Mn^{2+} +Sn^{4+}[/tex]
The half cell reactions are :
(1) MnO4- → Mn2+ : Eo = +1.49V
(2) Sn4+ → Sn2+ : Eo = +0.15V
Since tin has a lower reduction potential than Mn, the Sn system serves as the anode and the Mn system as the cathode.
Balancing anode reaction : Sn2+ → Sn4+
Balance charge ( by adding electrons) : Sn2+ → Sn4+ + 2e- ----------------(1)
Balancing cathode reaction : MnO4- → Mn2+
Balancing O atoms ( by adding H2O ) : MnO4- → Mn2+ + 4H2O
Balancing H atoms ( by adding H+ ) : MnO4- + 8H+ → Mn2+ + 4H2O
Balancing charge ( by adding electrons) : MnO4- + 8H+ +5e- → Mn2+ + 4H2O -------(2)
The equation that balances the electrons is obtained by combining equations (1) and (2).
[5x Eqn(1)]+[2xEqn(2)] ⇒
5Sn2+ + 2MnO4- + 16H+ +10e- → 5Sn4+ + 10e- + 2Mn2+ + 8H2O
5Sn2+ + 2MnO4- + 16H+ → 5Sn4+ + 2Mn2+ + 8H2O
This is the balanced net ionic equation.
[tex]E^{o} cell = E^{o}cathode - E^{o}anode = +1.49 - (+0.15) V = +1.34 V[/tex]
[tex]We know that \alpha \Delta G^{0}=-nFE_{cell}^{0} Here n = number of electrons transferred = 10F = Faraday = 96500 C[/tex]
[tex]\Delta G^{0}=-10 x 96500 . 1.34 J \\=1.29 . 10^{6} J\\=1.29 . 10^{3} KJ\\[/tex]
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what volume of fluorine gas is produced when 0.427 mol of bromine trifluoride reacts completely according to the following reaction at 0°c and 1 atm? bromine trifluoride ( g ) bromine ( g ) fluorine ( g ) liters fluorine gas
95.5 L volume of fluorine gas is produced when 0.427 mol of bromine trifluoride reacts
PV=nRT
p=1 atm
v=?
n=0.427
R= 0.82
T= 273 K
V=nRT/P
V=0.427×0.82×273÷1
V=95.5 L
The volume of an object in three dimensions is the area occupied within its boundaries. It is referred to as the object's capacity on occasion. The amount required to fill an object can be determined by finding its volume, for example, how much water is required to fill a bottle, aquarium, or water tank.
The most fundamental and frequent form of a three-dimensional shape is a sphere. We frequently encounter spheres in the form of balls, globes, decorative lights, oranges, etc.
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Warm air rises at the equator and cold air sinks at the poles creating
Responses
A hurricanes.hurricanes.
B convection currents.convection currents.
C the Coriolis effect.the Coriolis effect.
D tornadoes.
Warm air rises at the equator and cold air sinks at the poles creating is B convection currents.
What is convection currents?Convection can be described as the single or multiphase fluid flow which can take place spontaneously as a result of the combined effects of material property heterogeneity as well as the body forces on a fluid, especially with density and gravity.
It should be noted that in case whereby Warm air rises at the equator and cold, there will be a phenonmenon in which the air sinks at the poles which will bring about the convection currents.
Therefore, option B is correct.
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what is the mass in kilograms of 1.20x10^28 atoms of copper, Cu?
Answer: Mass of 1 atom of Cu=63.546 A.M.U
=63.546×1.66×10^(-27) kg
= 105.48636×10^(-27) kg
So,
Mass of 1.2×1038 atoms of Cu
= 1.2×1028×105.48636×10^(-27) kg
= 130127.973696×10^(-27) kg ANS !!!!
the molecular geometry of the chf3 molecule is , and the molecule is . question 12 options: a) seesaw, nonpolar b) tetrahedral, polar c) tetrahedral, nonpolar d) trigonal pyramidal, polar e) seesaw, polar
The molecular geometry of the chf3 molecule is tetrahedral , and the molecule is polar.
The atomic configuration of a molecule in three dimensions is known as molecular geometry. Bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position are all included in this, along with the molecule's overall form. Molecule Geometries. Linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are the five primary shapes of simple molecules as described by the VSEPR theory.
A molecule is said to be tetrahedral when its centre atom has four bonds and no lone pairs. There are 109.5° angles between the atoms that are bound to the core atom and are situated at its four corners. Four substituents are positioned in the four corners of a tetrahedron, with the central atom in a tetrahedral molecular geometry being in the centre.
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how many moles of hydrogen peroxide will be oxidized by 0.043 5 moles of potassium permanganate an acidic solution
The number of moles of hydrogen peroxide will be oxidized by 0.0435 moles of potassium permanganate an acidic solution is 0.054375
What is titration?
Titration is a technique used to gauge an unknown substance's concentration. Titrations, for instance, can be used to calculate the volume of solution needed to neutralize an acid. Titrations are used in redox titrations to determine the amount of the oxidizing agent that is required to oxidize a substance.
Here,
H2o2(aq} −→ 2O2 + 2H+ 2e-
MnO4−(aq)+8H++5e−→Mn2+(aq)+4H2O(l)
Combining the oxidation and reduction half~reactions for hydrogen peroxide and permanganate ion, respectively, and writing the balanced chemical equation for the overall reaction between H2O2 and Mn04- in acid solution gives us
5 H2O2 + 2 MnO4– + 6 H+ -------> 2 Mn2+ + 8H2O + 5 O2
The mole ratio is 5 hydrogen peroxide molecules to 2 permanganate molecules in the reaction
Therefore moles oxidized by 0.0435 moles of potassium permanganate, using the ratio, is 0.054375
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If exactly one molecule of solute is present in 1. 00 l of solution, what is the concentration of the solution?.
The concentration is 1.66 x 10⁻²⁴M if exactly one solute molecule exists in one milliliter of solution.
What is a brief explanation of the word "molecule"?A molecule is the simplest unit of the a substance that keeps its content and properties. It is made up of two or maybe more atoms that are joined together by hydrogen bonds.
Briefing:1 molar solution is 1 mole in 1 liter.
1 mole = 6.022 x 10²³ molecules
1 molecule = 1/6.022 x 10²³ moles
= 0.166 x 10⁻²³ moles
So 0.166 x10⁻²³23 moles in 1 L means concentration = 1.66 x 10⁻²⁴M
Since 1 molecule solute means M= 1.66 x 10⁻²⁴M
1 x 10⁻²⁵M has only fraction of a solute molecule
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what is the calcium ion concentration, [ca2 ], in 1.5m calcium chloride, cacl2? what is the chloride ion concentration, [cl1-]?
For every mole of calcium chloride you get one mole of Ca2+ and 2 moles of chloride. So the molarity of calcium 2+ is 1.5 M and the molarity of the chloride is 3.0 M
What is Molarity?
Since most reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. The quantity of compounds in solution can be determined in a variety of methods.
The concentration of salts in the alkaline solution is represented by its molarity (M). The amount of fundamental substance needed to prepare the solution rises as molarity does. Molarity is crucial for the growth of strength.
The number of moles of dissolved solute per litre of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per millilitre of solution by dividing the number of moles and the volume by 1000.
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the molar mass of oxygen gas (o2) is 32.00 g/mol. the molar mass of c3h8 is 44.1 g/mol. what mass of o2, in grams, is required to completely react with 0.025 g c3h8? 0.018 grams 0.034 grams 0.045 grams 0.091 grams
The mass of O₂ in grams required to completely react with 0.025 g of C₃H₈ is 0.091 g.
The reaction is given as :
C₃H₈ + 5O₂ -----> 3CO₂ + 4H₂O
The mass of C₃H₈ = 0.025 g
mola mass of C₃H₈ = 44.1 g/mol
moles of C₃H₈ = mass / molar mass
= 0.025 / 44.1
= 0.00056 mol
moles of O₂ = 5 × 0.000567
= 0.00284 mol
molar mass of O₂ = 32 g/mol
mass of O₂ = moles × molar mass
= 0.00248 × 32
= 0.091 g
The mass of Oxygen required is 0.091 g to react with 0.025 g of C₃H₈ .
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what is the molarity of a solution made by dissolving 25 g fe(no3)3 in enough water to make 250.0 ml of solution?
The molar concentration of a solution created by decomposing 25 g of Fe(NO₃)₃ in 250.0 ml of water is 0.413M.
How are molarities determined?We divided the number of mole of solute by both the given quantity of liters of solutions to determine the mole ratio of a solution.
What does molarity refer to?The quantity of a material in a specific volume of solution is known as its molarity (M). The number of moles of something like a solute each liter of a solution is known as molarity.
Briefing:
m= 25,
Molar mass(M) of Fe(NO₃)₃ = 241.86g/mol
V= 0.25dm3,
Molarity(C) = ?
Moles = m/M= C×V
Substitute and Simplify
m/M = C×V
25/241.86= C×0.25
Molarity(C) = 0.413M
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What is retort stand used for?
And what are biohazardous substances?
Answer:
See explanation
Explanation:
A retort stand is a piece of scientific equipment intended to support other pieces of equipment and glassware — for instance, burettes, test tubes and flasks.Biohazardous waste products include infectious waste, animal waste, used sharps, discarded vaccines, and pathological waste.(a) the disorder alters glucose metabolism. describe the atoms and types of bonds in a glucose molecule.
in the disorder alters glucose metabolism, Covalent bonds hold carbon, hydrogen, and oxygen atoms together in a glucose molecule.
This glucose molecule is made up of six carbon atoms bonded together in a chain, along with oxygen and hydrogen atoms. C6H12O6 is the chemical formula for glucose. Glucose is an aldehyde-containing monosaccharide (-CHO) Covalent bonds form between nonmetals in general. The formation of ions occurs when one metal and a nonmetal convers. Carbon, hydrogen, and oxygen combine to form glucose. Because they are all nonmetals, they form covalent bonds.
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dr. sweeney is a research chemist who recently discovered an old bottle labeled perchloric acid (hclo) in the back of his research laboratory. after verifying that the contents of the bottle were indeed hclo, dr. sweeney was interested in determining the concentration of hclo in the bottle. to determine the concentration of hclo, dr. sweeney performed a titration using 20 ml of hclo, 0.04 m naoh, and phenolphthalein as an indicator solution. dr. sweeney determined that it took 24 ml of 0.040 m naoh to reach the endpoint of the titration.
a. What did Dr. Sweeney observe to indicate the endpoint in his titration? b. Write the chemical equation that represents the chemical reaction that Dr. Sweeney was studying. c. What type of chemical reaction is this? d. What is the concentration of HC10_4 in the bottle that Dr. Sweeney found?
Dr. Sweeney observed the end-point of the titration, the chemical equation is HClO4 (aq) + NaOH (aq) → NaClO4 (aq) + H2O (l), The reaction is a neutralization reaction and the concentration of HCl04 is 0.048 mol/L.
To calculate the concentration of a specified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A reagent, also known as a titrant or titrator, is created as a standard solution with a specified concentration and volume. The goal of the titration is to identify the equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined.
In a chemical reaction called neutralisation reaction, an acid and a base interact quantitatively. In a process in water, neutralisation leads to the absence of excess hydrogen or hydroxide ions in the solution. A neutralisation reaction is a chemical process in which an acid and a base quantitatively combine to produce salt and water as byproducts.
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what happens to the electron configuration of the outermost energy level as atomic number increases across a horizontal row?
As atomic number increases across a horizontal row, the electron configuration of the outermost energy level will become more complex.
This is because each successive element has one additional electron, which will be added to the highest-energy orbital available. As the atomic number increases, more orbitals will become available, which will increase the complexity of the electron configuration in the outermost energy level.
The Impact of Atomic Number Increases on the Electron Configuration of the Outermost Energy LevelIn the modern universe, the behavior of matter is a topic of great interest. The discovery of atomic structure in the mid-19th century changed the way scientists understood the behavior of matter. Atoms contain nuclei and electrons, and the number of the latter is determined by the atomic number.
The atomic number refers to the number of protons present in the nucleus of an atom. This means that the atomic number determines the number of electrons an atom possesses. These electrons are distributed in different energy levels, and the outermost energy level is the last to receive electrons. This means that the atomic number has a direct impact on the electron configuration of the outermost energy level.
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a solution of dispersant is made by taking 15.0 ml of a 60.0 mg⋅ml−1 solution of tween 80 and mixing it with 55.0 ml of water. calculate the final concentration of the tween 80 in this solution, in units of grams per milliliter.
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
What is Solution?
In science, a solution is a particular kind of mixture made up of two or more substances. The definition of a solution specifically relates to a certain class of homogeneous mixture, that is, a mixture with a uniform composition and no discernible differences between its constituent parts. This is distinct from a heterogeneous mixture, where each component can be seen separately.
Although mixtures of gases or solids can also be included in solutions, liquid mixtures are the most common type. A solvent and a solute are needed to create a solution.
As we know
C1V1 = C2V2
C1 and C2 = concentration of solution 1 and 2 respectively
V1 and V2 = Volume of solution 1 and 2 respectively
Substituting the given values, we get -
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
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substances that give a visibly colored solution can be analyzed using spectrophotometry. cu2 forms a complex with edta that is pale blue in aqueous solution. a chemist plans to determine the concentration of cu2 ions in solution using edta complexation, and the chemist obtains the following data using standard solutions. the path length of the cell used is 1.00 cm.
Ethylenediamine tetraacetic acid (EDTA) substances that give a visibly colored solution can be analyzed using spectrophotometry. cu2 forms a complex with edta that is pale blue in aqueous solution.
Abdominal cramps, nauseousness, vomiting, diarrhea, headaches, low blood pressure, skin issues, and fever are just a few of the side effects that EDTA can bring on. It is NOT SAFE to consume EDTA for more than 5 to 7 days or in doses greater than 3 grams per day. Overdosing can result in mortality, dangerously low calcium levels, and renal injury. Absorption spectrophotometry, which examines how radiation and certain light spectra are absorbed, and Ultraviolet-Visible Range spectrophotometry, which examines how certain light spectra are reflected from a given source, are the two main forms of spectrophotometry that are used.
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how many conjugated bonds have are uv active and expected to absorb radiation between 200 and 400 nm?
The compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.
What is chemical bond?
Atoms in molecules are joined by chemical bonds. Electrostatic forces between negatively charged electrons and positively charged atomic nuclei result in bonds.
What is UV?
The wavelength of ultraviolet (UV) radiation ranges from 10 nanometers (with a corresponding frequency of about 30 PHz) to 400 nanometers (750 THz), which is shorter than that of visible light but longer than X-rays.
The compounds C, D and E shows UV absorbance between 200-400 nm.
The compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.
Therefore, compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.
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how to solve a titration problem for how many ml of a solution you need to reach the secodn equivalence point knowing the starting volume and the balanced equation
Your base titrant volume reading was 1.18 mL at the start of the titration. The base titrant volume was 23.00 mL when the titration was finished and the endpoint was reached.
When just enough titrant is added to completely neutralize the analyte solution during titration, this is known as the equivalence point. Molecules of base equal molecular weights of acid at the equivalence point in an acid-base titration and the solution is made up entirely of salt and water.
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explain why the spectra belongs with methyl butanoate. did the spectra you picked match your initial description?
The methyl butanoate is the ester. the ester contains C = O, carbonyl stretching is found about the 1735 cm⁻¹.
The methyl butanoate is from the ester family. it is also called as methyl butyrate. it is colorless liquid the odor of methyl butanoate is like an apple. methyl butanoate is used as solvent. the structure of methyl butanoate can be determine by the IR spectra. it is also used as an flavoring agent.
The methyl butanoate if from the methyl ester of butyric acid. the methyl butanoate is present is several plant product in very small amount. it is formed by the distillation from the essential oils of vegetable.
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) what are the maximum (peak) mixing ratios of ozone (o3), nitric oxide (no), and nitrogen dioxide (no2) during these eight days?
These numbers show that the highest mean O3 concentration occurs during the daytime and is higher than it is at night. While there is a greater mean NO concentration at night.
O3 and NO2 exhibit a diurnal tendency, right?The NO, NO2 and NOx diurnal cycles resemble double waves. The morning peak is larger than the evening peak in size. The morning peak of NO2 arrives 1-2 hours after the NO peak, while the morning peaks of O3 appear roughly 6 hours, 5 hours, and 2 hours after the NO2 peak, respectively.
When do NOx gas levels peak during the day?The higher levels of NOx coincide with the peak hours for vehicular emissions, which are in the morning and evening.
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If exactly one molecule of solute is present in 1. 00 l of solution, what is the concentration of the solution?.
A molar solution is one that contains 1 mole of a material in 1 liter of water.
The concentration is 1.66x10-24 M if there is exactly one molecule of the solute in one litre of solution.
In this situation, 1 mole is defined as 6.02x10²³ particles, or molecules. As a conversion factor, consider the following:
1 mole = 6.02 x 10²³ molecules.
When only 1 molecule of the solute is present, use this conversion factor to determine moles of the solute:1.66x10-24 moles are equal to (1 molecule)/((1 mole)/(6.02x1023 molecules)).
Only moles remain after the molecules cancel.
By definition, concentration is the number of moles of a solute per litre. Divide the volume, in this case 1.0L, by the 1.66x10-24 moles to get:
1.66x10-24 molar, or 1.66x10-24 M, = (1.66x10-24 moles solute)/(1.0 litre).
What is the solution's concentration when 1 mole of solute dissolves in 1 liter of solution?A way to express solution concentration is by molarity. It is described as the quantity of solute that dissolves in one liter of solution.
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Predict the neutral organic product of the following reaction. When drawing hydrogen atoms on a carbon atom, either include all hydrogen atoms or none on that carbon atom, or your structure may be marked incorrect.
The oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
What is neutral organic?
The microbial decay of dead plant and animal matter is what causes NOM to exist in the environment. The Chemistry of Silica and Zeolite-Based Materials
What is hydrogen atom?
The chemical element hydrogen is represented by the atom known as hydrogen. The Coulomb force holds one negatively charged electron and one positively charged proton to the nucleus of the electrically neutral atom, which has one proton that is positively charged. Of the universe's total baryonic mass, atomic hydrogen accounts for about 75%.
The given reaction is an acid catalyzed hydration of alkenes. The hydration reaction converts an alkene to an alcohol.
Hydration of alkenes involves the conversion of alkenes to alcohols via the addition of water. Acid catalyzed hydration involves the presence of an acid such as sulphury acid.
Since, a carbocation is formed in the acid catalyzed hydration of alkenes, hence carbocation rearrangement occurs to form a more stable carbocation.
In the above step, the attack of double bond on the hydronium ion takes place to form a 2° carbocation. The direction of electrons is from the electron rich π bond to proton.
In the above step, the nucleophilic attack of water takes place on the secondary 2° carbocation to form the oxonium ion. The direction of movement is from the electron rich water molecule to the electron deficient carbocation species.
Finally, in the above step, the deprotonation of the oxonium ion takes place to form cyclooctane. The oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
Therefore, the oxygen of water molecule being electron rich abstracts the proton from the oxonium ion to form hydronium ion.
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how many molecules of ch4 are in 48.2 g of this compound? question 19 options: 3.00 5.00 × 1024 4.00 2.90 × 1025 1.81 × 1024
In response to the question, 48.2 gram of CH4 contain 1.81*10²⁴ molecules of CH4.
What are some instances of molecules?A molecule is the simplest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the material's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the atom and molecule are O and O2, respectively.
Which four sorts of molecules are there?Large biomolecules can be divided into four categories: lipids, proteins, nucleic acids, and carbohydrates. Monomers called oligosaccharides, which comprise oxygen, oxygen, or hydrogen, are the building blocks of carbs.
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The complete question is-
How many molecules of ch4 are in 48.2 g of this compound?
(a). 3.00
(b). 4.00
(c). 2.90*10²⁵
(d). 5.00*10²⁴
(e). 1.81*10²⁴
the mass of solute per 100 ml of solution is abbreviated as (m/v). mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. how many grams of sucrose are needed to make 795 ml of a 40.0% (w/v) sucrose solution?
Mass of sucrose is 378 grams
[tex]\% \mathrm{~m} / \mathrm{V}=\frac{\text { Mass of sucrose }}{\text { Volume of solution }}[/tex]
[tex]\text { Let } m=\text { mass of sucrose }[/tex]
[tex]\frac{40.0 \mathrm{~g}}{100 \mathrm{~mL}}=\frac{m}{795 \mathrm{~mL}}[/tex]
[tex]m=\frac{40.0 \mathrm{~g} \times 795}{100}[/tex]
= 378 g
What is mass?
A scientific term used to represent the density and kind of atoms in any given article is called mass.
What is sucrose?
A disaccharide is a sugar composed of glucose and fructose subunits is sucrose. It is produced naturally in plants and is the main ingredient of white sugar.
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which of these statements is incorrect? a. the binding forces in a molecular solid include london dispersion forces. b. ionic solids are insulators. c. all of the statements (a-d) are correct. d. molecular solids have high melting points. e. ionic solids have high melting points.
Ionic solids are therefore insulators, which is the right response. Choice "B."
Explain what an insulator is.An insulator is any substance that prevents the energy—such as electricity, heat, or cold—from the moving through it easily. Good insulators include glass, plastic, rubber, and the wood.
Which insulator is the used most frequently?The most popular and generally accessible type of insulation, blanket, comes in the form of rolls or batts. Flexible fibres, most frequently fibreglass, make up this substance. Additionally, natural fibres like cotton and sheep's wool are available in batts and rolls, along with artificial fibers and mineral wool.
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enough of a monoprotic acid is dissolved in water to produce a 1.35 m solution. the ph of the resulting solution is 2.68 . calculate the ka for the acid.
Ka=5.3*10^(−11) By definition, Ka will be equal to Ka= [H3O+]*[A-]/[HA]Now use the pH of the solution to determine the equilibrium concentration of hydronium
How do you determine an acid's Ka?We shall first ascertain the pKa of the solution before calculating the Ka. The pH of the solution and the pKa of the solution are equal at the equivalence point. As a result, we can quickly calculate the value of Ka using a titration curve and the equation Ka = - log pKa.
How to determine Ka?The ionisation constant (Ka) of formic acid can be calculated by the following formula;-
Ka = {[H+] * [HCOO-]} / [HCOOH]
Therefore you would need to know the value of each of the three concentration values on the right-hand side of the equation.
The equation for the dissociation of formic acid is;-
HCOOH ⇌ H+ + HCOO-
From this equation it can be seen that, at any degree of ionisation, the moles of H+ ions produced is equivalent to the moles of HCOO- ions. Therefore we can say that;-
[H+] = [HCOO-]
So, the equation for Ka in this case becomes;-
Ka = {[H+] * [H+]} / [HCOOH]
Ka = [H+]^2 / [HCOOH]
So, we have simplified our Ka formula down to two values, the H+ ion concentration [H+], and the concentration of undissociated formic acid [HCOOH]. To calculate the Ka for formic acid, we therefore need to either measure, or be given these values.
For example, if we started with a solution of formic acid which was 0.1M, we could measure its pH. Since pH = -log[H+], we could then calculate the H+ ion concentration and solve the Ka equation.
As it turns out the pH of a 0.1M formic acid solution is 2.38. Therefore, for this formic acid solution;-
-log([H+]) = 2.38
log([H+]) = -2.38
[H+] =10^(-2.38)
[H+] = 0.0042 M
Also, since formic is a relatively weak acid we can use the original solution concentration. i.e. [HCOOH] = 0.1M
Now we can solve the Ka equation we simplified above;-
Ka = [H+]^2 / [HCOOH]
Ka = (0.0042 )^2 / 0.1
Ka = 1.764 * 10^-4
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calculate the change in ph when 9.00 ml of 0.100 m hcl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in nh3(aq) and 0.100 m in nh4cl(aq). consult
The change in ph when 9.00 ml of 0.100 m hcl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in nh3(aq) and 0.100 m in nh4cl(aq). consult
1)
Step 1: Calculate initial pH
Kb = 1.8*10^-5
pKb = - log (Kb)
= - log(1.8*10^-5)
= 4.745
use:
pOH = pKb + log {[conjugate acid]/[base]}
= 4.745+ log {0.1/0.1}
= 4.745
use:
PH = 14 - pOH
= 14 - 4.7447
= 9.2553
Step 2: Calculate pH after adding HCl
mol of HCl added = 0.1M *9.0 mL = 0.9 mmol
NH3 will react with H+ to form NH4+
Before Reaction:
mol of NH3 = 0.1 M *100.0 mL
mol of NH3 = 10 mmol
mol of NH4+ = 0.1 M *100.0 mL
mol of NH4+ = 10 mmol
after reaction,
mol of NH3 = mol present initially - mol added
mmol of NH3 = (10 - 0.9) mmol
mol of NH3 = 9.1 mmol
mol of NH4+ = mol present initially + mol added
mol of NH4+ = (10 + 0.9) mmol
mol of NH4+ = 10.9 mmol
since volume is both in numerator and denominator, we can use mol instead of concentration
Kb = 1.8*10^-5
pKb = - log (Kb)
= - log(1.8*10^-5)
= 4.745
After the reaction, the following equation holds true: mol of NH3 = mol present initially - mol added mmol of NH3 = (10 - 0.9) mmol mol of NH3 = 9.1 mmol mol of NH4+ = mol present initially + mol added mol of NH4+ = (10 + 0.9) Since volume appears in both the numerator and denominator of the equation, we can use mol in place of concentration: mmol mol of NH4+ = 10.9 mmol
Kb = 1.8*10-5 pKb = -log(Kb) = -log(1.8*10-5) = 4.745
Employ: pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [10.9/9.1] = 4.823
employ: PH = 14 - pOH = 14 - 4.8231 = 9.1769
Step 3: Subtract the final pH from the initial pH to arrive at a change delta pH of -0.0784 (9.1769 - 9.2553).
Incorrect: -0.0784
2) The reaction between NH4+ and OH- will produce NH3 when mol of NaOH supplied is 0.1M *9.0 mL = 0.9 mmol.
NH3 = 0.1 M * 100.0 mL mol of NH3 = 10 mmol NH4+ = 0.1 M * 100.0 mL mol of NH4+ = 10 mmol
After reaction, the equation is: Mol of NH3 = Mol originally present + Mol of NH3 added = (10 + 0.9). mmol mol of NH3 equals 10.9 mmol mol of NH4+ equals mol initially present minus mol added mol of NH4+ = (10 - 0.9) Since volume is in both the numerator and the denominator of mmol mol of NH4+ = 9.1 mmol, we can substitute mol for concentration.
Kb = 1.8*10-5 pKb = -log(Kb) = -log(1.8*10-5) = 4.745
Make use of: pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [9.1/10.9] = 4.666
employ: PH = 14 - pOH = 14 - 4.6663 = 9.3337
delta pH = final pH - initial pH
= 9.3337 - 9.2553
= 0.0784
Answer: 0.0784
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any substance that moves electrons either out of or into a material where electrochemical reactions occur; example is anode or cathode.
Any substance that moves electrons out of the material is cathode and that moves electron into a material is anode.
Electrochemical reactions is the flow of electric current through electrons between electrodes and electrolyte. The anode is the positive electrode in the reaction and cathode is the negative one.
Conversely, anions and cations are negatively and positively charged ions. Thus, anode contains negative charges which are released into the electrolyte or material. The cathode is positive side which receives those anions from the material. Thus, removing the electron out of material.
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A beryllium ion with a single electron (denoted $Be^{3+} ) is in an excited state with radius the same as that of the ground state of hydrogen.a. What is n for the Be3+ ion?b. How much energy in eV is needed to ionize the ion from this excited state?
When conduct electricity an ion from this excited state, 54.4 eV of energy must be provided.
What is an definition of energy?
Energy is referred to and by scientists as the capacity for work. People have figured out how to transform energy from one type to another and then use it to accomplish tasks, making modern civilization possible. Chemical, electrical, radiant, mechanical, thermal, and nuclear energy are the six main types of energy. Additional forms including electrochemical, acoustic, electromagnetic, and others might be addressed in other studies.
Briefing:
Since this electron has an energy of,
E₂=-Z²*13.6/n² eV
=-4²*13.6/2² eV
=-54.4eV
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What is the amount of product obtained in a reaction known as?
Answer: Actual Yield
Cold packs, whose temperatures are lowered when ammonium nitrate dissolves in water, are carried by athletic trainers when transporting ice is not possible. Which of the following is true of this reaction?
Group of answer choices
ΔH = 0, since cold packs are sealed
ΔH > 0, process is endothermic
ΔH > 0, process is exothermic
ΔH < 0, process is exothermic
ΔH < 0, process is endothermic
When sports trainers transfer cold packs, which have temperatures dropped when ammonium nitrate dissolves in water when ice cannot be transported, the process is endothermic (Î"H > 0).
For what is nitrate renowned?For the growth of plants in particular, and therefore for other species that get their nourishment from plants, they serve as a significant supply of nitrogen. Nitrates are used for a number of things, such as fertilizers, food preservatives, drugs, and explosives.
Why do nitrates cause toxicity?Nitrate poisoning may be dangerous, especially for infants. Methemoglobinemia may result from excessive nitrate consumption, which can alter how blood delivers oxygen (also known as blue baby syndrome). The risk of developing methemoglobinemia is higher in infants who are bottle-fed and under six months old.
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