A cup of hot coffee initially at 95ºc cools to 80ºc in 5 min while sitting in a room of temperature 21ºc. using just newton’s law of cooling, determine when the temperature of the coffee will be a nice 50ºc
In 10 minutes the hot coffee will attain the temperature of 50 degrees Celsius.
Initially the hot cup of coffee at the temperature of 95 degrees Celsius but after 5 minutes its temperature decreases from 95 to 85 degrees Celsius which is 15 degrees Celsius decrease so in other 5 minutes, the temperature decreases to 65 degrees Celsius.
Again after 5 minutes the temperature will further decrease finally the cup of coffee attain the temperature of 50 degrees Celsius so we can conclude that in 10 minutes the hot coffee will gain the 50 degrees Celsius temperature.
According to Newton's Law of cooling, the charge of loss of heat from a body is immediately proportional to the difference in the temperature of the frame and its surroundings.
The price, wherein a frame that is uncovered, modifications the temperature thru radiation is about proportional to the difference among the item's temperature and its environment, and the furnished difference is low. that is called Newton's law of cooling.
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What is the concentration in % (m/v) of a nacl solution prepared by dissolving 9. 3 g of nacl in sufficient water to give 350 ml of solution?.
350 ml of NaCl solution made by combining 9. 3 g of NaCl with enough water to dissolve it has a 0.458M molarity.
The solution is represented by molarity. M stands for "molarity," which is the amount of solute in moles per liter of solution.
The formula for calculating molarity is
M = moles of solute/liter of solution.
The mass of NaCl is 9.3 g, the volume of the solution is 350 mL, and the volume of the solution in liters is given by 350/1000, or 0.35 L.
M = moles of NaCl/liter of solution is the formula used to calculate M.... (1)
Therefore, we must first determine the moles of NaCl.
Molar mass (NaCl)/mass of NaCl = moles of NaCl...... (2)
NaCl's molar mass is 58 g/mol.
Add values to Eq (2)NaCl moles are 9.3 g/58 g/mol.NaCl moles equal 0.16 mol. Place the numbers in Eq. (1) as follows:
M = 0.16 mol/0.35 L
M = 0.458
The Molarity then equals 0.458M.
The molarity is 0.458M as a result.
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a balloon is filled to a volume of 1.75 l with 3.50 moles of gas at 25 °c. with pressure and temperature held constant, what will be the volume of the balloon if 0.25 moles of gas are released?
The volume of the balloon if 0.25 moles of gas are released is 1.3L.
Solution:
[tex]\frac{1.75L}{3.50mol} = \frac{V_{2} }{2.6 moles}[/tex]
V₂ = 1.75 L * 2.6 moles/3.50 moles
= 1.3L
If the temperature and pressure are kept constant, the volume of the gas is directly proportional to the number of gas molecules. At constant temperature and volume, the pressure of a gas is directly proportional to the number of gas molecules present. As the balloon heats up, it expands and the air inside the balloon becomes less dense.
The volume and temperature kept changing so that the pressure remained constant. If the temperature is kept constant, the volume of a given amount of gas is inversely proportional to its pressure. Under the same conditions of temperature and pressure, the same volume of all gases contains the same number of molecules.
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also known asa toxic heavy metal , the lead in some paints is an example ofhazardous waste. why?
Except for combustible, oil-based paint, which contains lead, mercury, arsenic, et cadmium, it's likely your you color is just a garbage that needs special handling.
What is a metal, exactly?Metal is any of a group of substances with strong thermal and electrical conductivity, mutability, flexibility, and high light reflection.
How useful is metal?Metals are excellent building materials. Strength, hardness, and stiffness are just a few of the qualities metal metals possess. Metals may be heated and formed into anything, from a little paperclip to an enormous airplane. They are important for wires or cooking pans as they are efficient heat and electricity conductors.
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In the Introductory Activity, the developing solvents were 2% sodium chloride aqueous solution and 2% isopropyl alcohol aqueous solution. Draw separate molecular diagrams of how sodium chloride and isopropyl alcohol would interact in water. Identify the types of intermolecular attrac- tions within each diagram.
the developing solvents were 2% sodium chloride aqueous solution and 2% isopropyl alcohol aqueous solution
What occurs if you combine salt and rubbing alcohol?Isopropyl alcohol can be "salted out," which uses salt to remove water from the substance and thereby boosts its potency. When salt is added to water, it dissolves, but is insoluble in isopropyl alcohol, which causes the water to become heavier and sink to the bottom while the alcohol floats to the top.
Salt and alcohol can they be dissolved?Salt and alcohol do not interact, despite the fact that water and alcohol do. The solution becomes salty when salt is added, but the salt dissolves in the water but not the alcohol.
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the beta decay of cesium-137 has a half-life of 30.0 years. how many years must pass to reduce a 26 mg sample of cesium 137 to 5.7 mg?
Answer:
10 pts you say?
Explanation:
draw the main organic products of the reaction. indicate the stereochemistry, including all hydrogen atoms, at each stereocenter. omit byproducts such as salts or methanol. the starting material is a 6 carbon ring where carbon 1 has a wedged bond to bromide and a dashed bond to hydrogen. moving counterclockwise, carbon 2 has a wedged bond to methyl and a dashed bond to hydrogen. this reacts with c h 3 o n a and methanol to form the product.
Well here i can't provide the diagram of the starting material is a 6 C ring where C 1 has a wedged bond to bromide (Br) and a dashed bond to hydrogen. moving counterclockwise, C 2 has a wedged bond to methyl and a dashed bond to hydrogen. this reacts with c h 3 o n a and methanol to form the product.
Describe the following :What is Bromide?Bromide is the negatively charged member of the halogen group and is a form of Bromine element. Bromine's atomic no is 35 and atomic mass is 79.904 u.
Methanol:Methanol is first of all is a organic chemical with the formula CH₃OH. It is an aliphatic alcohol which is colorless and volatile in nature.
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Compound B has molecular formula C6H10 and gives (CH3)2 CUCH2CH2CH3 when treated with excess H2 in the presence of Pd. B reacts with NaNH2 and CH3I to form compound C (molecular formula C7H2).
The compound B is 3,3-dimethyl-1-butyne, and the compound C is 4,4-dimethyl-2-pentyne.
Alkynes are hydrocarbons that have triple bonds between carbon atoms. CₙH₍₂ₙ₋₂₎ is the typical formula for molecules with one triple bond. Alkynes undergo many of the same reactions as alkenes, but because a triple bond contains two p-bonds, they can react twice.
Here, compound B with the molecular formula C₆H₁₀ is 3,3-dimethyl-1-butyne and compound C is 4,4-dimethyl-2-pentyne. The compound B reacts with sodium amide (NaNH₂) and methyl iodide (CH₃I), giving the compound C. This reaction explains the acidity of non-terminal alkynes.
In this reaction, sodium amide first abstracts the protons from carbon atoms near the triple bond. The resulting carbanions undergo rapid proton transfer equilibria to form a stable terminal alkyne conjugate base.
The reaction is attached.
The complete question is -
Identify the compounds B and C. Compound B has molecular formula C₆H₁₀ and gives (CH₃)₂CHCH₂CH₂CH₃ when treated with excess H₂ in the presence of Pd. B reacts with NaNH₂ and CH₃I to form compound C (molecular formula C₇H₁₂).
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what is the maximum number of electrons in an atom that can have these quantum numbers? n = 3, l = 2, ms = - 1/2
The most electrons that can have the quantum numbers n = 3, l = 2, and ms = -1/2 in an atom is 10.
Each electron in an atom is quantized using four quantum numbers:
The energy of the electron shell, which corresponds to the separation from the nucleus, is described by the principal quantum number (n). N must be an integer with a positive value.
The electron's orbital form is described by the angular momentum quantum number (l). L has an integer value that ranges from 0 to n-1.
The orbital's orientation with respect to the three axes of space is described by the magnetic quantum number (ml). An integer with the values -l to +l makes up the value for ml.
There are only two potential values for the spin quantum number (ms), which describes the electron's spin: +1/2 or -1/2.
The maximum number of electrons that can have the main quantum number of 3 and an angular momentum quantum number of 2 is what we are interested in learning in this inquiry. Since there are only two conceivable values for the spin quantum number, we know that a maximum of two electrons with opposite spins can occupy an orbital. The greatest number of electrons that can have the quantum numbers n=3 and l=2 can be calculated by counting the number of orbitals that can have a value of l=2 and multiplying that number by two.
The possible values for ml are -2, -1, 0, 1, and 2, since l=2 and we know from the information above that ml is an integer that ranges from -l to +l. This demonstrates that the total number of orbitals with the angular momentum quantum number l=2 is five. We obtain 52=10 by putting two electrons into each of these orbitals.
An electron with the quantum numbers n = 3 and l = 2 can have a maximum of 10 electrons.
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at 50.14 k a substance has a vapor pressure of 258.9 torr. calculate its heat of vaporization in kj/mol it if has a vapor pressure of 161.2 torr at 277.5 k
At 50.14 k a substance has a vapor pressure of 258.9 torr. its heat of vaporization in kJ/mol it if has a vapor pressure of 161.2 torr at 277.5 k is
given that :
temperature T1 = 50.14 K
pressure P1 = 258.9 torr
temperature T2 = 277.5 K
pressure P2 = 161.2 torr
using the Clausius Clapeyron , we get :
ln ( P1 / P2 ) = - ΔH / R (1/ T1 - 1/T2)
ln ( 258.9 / 161.2 ) = - ΔH / 8.314 ( 1/ 50.14 - 1 / 277.5 )
ΔH = 41.83 kJ/ mol
The heat of vaporization ΔH = 41.83 kJ/ mol.
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What postulate of the kinetic molecular theory best explains why gases have high fluidity? because collisions between gas particles are elastic, there is no loss of energy as particles flow past each other. Because gases consist of large numbers of tiny particles, they spread out and do not come in contact with each other. Because the attractive forces between gas particles are negligible, gas particles can glide easily past one another. Because the average kinetic energy of gas particles increases as temperature increases, gas particles behave more like a liquid.
the elasticity of gas particle collisions, there is no energy loss when the particles pass one another. Gases are composed of a very large number of small particles, which spread out and avoid contact with one another.
Which of the following gas postulates from the kinetic molecular theory best explains why pressure exists in gases?As the quantity of gas particles in the container rises, so does the frequency of wall interactions and subsequently the pressure of the gas. The average kinetic energy of a gas particle is exclusively dependent on the temperature of the gas, says the theory's final postulate. As the volume of gas particles inside the container grows, more of them will collide with the walls, increasing the pressure and the frequency of collisions.
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Answer:
Because collisions between gas particles are elastic, there is no loss of energy as particles flow past each other.
what does the detector measure, and how are these numbers used to calculate transmittance and then absorbance?
The detector is used to measure the transmittance as well as the absorbance.
Through transmittance, the total light that passes through the sample is measured. Through absorbance, the total amount of light that can be observed by an object is measured.
The numbers that are generated on the spectrophotometer by the transmitter represent the total light given and that which is absorbed. By using these numbers we can measure the transmittance. The rate of transmittance as well as absorbance for each sample will be different.
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how many moles of magnesium oxide are produced by the reaction of 3.82 g of magnesium nitride with of water? mg3n2 3h2o → 2nh3 3mgo question 22 options: 0.114 0.0756 0.429 4.57 0.0378
The reaction will produce 6.61 mole of magnesium oxide.
What is the purpose of magnesium oxide?
There are several uses for magnesium oxide. Some people use it as an antacid to treat acid indigestion, digestive problems, and heartburn. Magnesium oxide can also be used as a laxative to quickly and temporarily empty the bowels (before surgery, for example).
Briefing:
This clearly demonstrates that 100.95g magnesium nitride reacts with 108.06g of water to give stoichiometric ammonia and magnesium oxide.
moles of Mg3N2 = 3.82g /100.95g per mole =0.0387 mole
mole of OH2 = 7.73g/18.01g per mole
magnesium oxide, i.e. 0.0387 mole × 58.32g per mole= 6.61mole
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Make a claim about whether air is matter. Support the claim with evidence and explain your reasoning
Answer: Yes
Explanation:
Air is matter because it takes up space, has weight and is composed of particles.
How does the strength of the imfs in water compare to the strength of the imfs in ethanol?.
Water has higher intermolecular force strength as compared to that of ethanol.
Water can form hydrogen bonds four ways as compared to ethanol that can form hydrogen bonds two ways. thus, water has strong bonds.
The interaction known as hydrogen bonding, which involves a hydrogen atom sandwiched between two other atoms with a high affinity for electrons, is stronger than van der Waals forces but weaker than ionic or covalent bonds. Atoms in separate molecules or distinct regions of the same molecule can form hydrogen bonds with one another. A hydrogen atom (FH, NH, or OH) is covalently bound to one of the pair's (the donor) typically fluorine, nitrogen, or oxygen atoms, with which it shares electrons unevenly. As a result of this high electron affinity, the hydrogen gains a little positive charge. The other atom in the pair, which is usually F, N, or O, has an unshared electron pair, giving it a little negative charge.
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Technician a says that gasoline engines have spark plugs to ignite the air-fuel mixture. Technician b says that diesel engines use compression to ignite the air-fuel mixture. Who is correct?.
Answer:
Both technician a and b are correct that gasoline engines have spark plugs to ignite the air-fuel mixture. Technician b says that diesel engines use compression to ignite the air-fuel mixture.
Explanation:
Gasoline engines- Any of a group of internal combustion engines known as gasoline engines produce power by igniting a volatile liquid fuel (such as gasoline or a gasoline combination like ethanol) with an electric spark.
Diesel engines-The Rudolf Diesel-inspired diesel engine is a type of internal combustion engine known as a compression-ignition engine because it ignites fuel by heating the air in the cylinder as a result of mechanical compression (CI engine). This contrasts with engines that ignite the air-fuel mixture using spark plugs, such as gasoline or gas engines (using a gaseous fuel like natural gas or liquefied petroleum gas).
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provide a reason to explain why the less stable radical intermediate leads to the formation of the major product in this reaction.
Hybridization, electronegativity, and polarizability are three variables that affect the stability of free radicals. The unpaired electron in these radicals, which tends to donate or acquire another electron to achieve stability, is the cause of their high reactivity.
Because the bromine radical is less reactive, it is more selective for the 2° radical. Cl is less picky and less selective due to its lower stability and increased reactivity.
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which of the following statements is incorrect about a concentration cell consisting of the same metal and metal ion solutions at different concentrations? a) reduction occurs in the more concentrated solution. b) the cell containing the more concentrated solution is the anode. c) the standard electrode potential (e°) of the electrochemical cell is zero d) the greater the difference in concentrations of the half-cells, the greater the initial voltage is. e) a spontaneous redox reaction occurs until the concentrations become equal.
The statements that is incorrect about a concentration cell consisting of the same metal and metal ion solutions at different concentrations is the cell containing the more concentrated solution is the anode.
So option B is correct.
What are metal ion solutions?A metal ion solution or aqua ion is described as a cation, dissolved in water, of chemical formula [Mₙ]ᶻ⁺. The solvation number, n, determined by a variety of experimental methods is 4 for Li⁺ and Be²⁺ and 6 for most elements in periods 3 and 4 of the periodic table.
A concentration cell is also described as a limited form of a galvanic cell that has two equivalent half-cells of the same composition differing only in concentrations. A spontaneous redox reaction occurs in a concentration cell until the concentrations of the solutions become equal.
The cell containing the more concentrated solution is the cathode while the cell containing the less concentrated solution is the anode.
Also, the standard electrode potential (e°) of the electrochemical cell is zero.
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the model illustrates a process by which a substance is taken up by a cell. which statements describe the process? select the correct answer. (1 point)
The model shows the process of endocytosis.
What is endocytosis?
A biological process called endocytosis allows chemicals to enter the cell. An region of cell membrane that surrounds the substance to be swallowed then buds off inside the cell to create a vesicle containing the substance to be ingested. Pinocytosis (cell sipping) and phagocytosis are two types of endocytosis (cell eating). It is an active mode of transportation.Receptor-mediated endocytosis, sometimes referred to as clathrin-mediated endocytosis, caveolae, pinocytosis, and phagocytosis are the four subcategories of endocytosis mechanisms.Small molecules are transported through the phospholipid bilayer by the carrier and channel proteins explained in the section above. By use of a unique procedure known as endocytosis, eukaryotic cells may also take in macromolecules and particles from the surrounding media.Christian deDuve first used the word "endocytosis" in 1963.To know moremore about endocytosis, click the link given below:
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What is the answer of number 11?
Hope this helps!
If molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy which molecule will be moving the fastest?.
Among hydrogen, nitrogen, oxygen and chlorine gas particles, hydrogen has the smallest particles will move with the fastest speed.
The formula of kinetic energy is :
KE= 1/2 (Mv^2)
Where, KE = kinetic energy
m = mass of the gas particle
v = velocity of the gas
Different gas particles move at different speeds with this kinetic energy—gases with smaller particles tend to be moving faster at the same temperature, which means they have a higher speed.
Among hydrogen, nitrogen, oxygen and chlorine gas particles, Chas the smallest particles will move with the fastest speed.
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for a cell consisting of cu(s) in 0.03 m cu(no3)2(aq) and cu(s) in 1.49 m cu(no3)2(aq), what is the value of ecell in v (assume 298k)?
For a cell made up of cu(s) in 0.03 m cu(no3)2(aq) and cu(s) in 1.49 m cu, the value of ecell in v (assuming 298k) is 2.0 V. (no3) 2(aq)
What is the process of a solar cell?
Galvanic (or voltaic) cells generate an electric current via a thermodynamically advantageous redox reaction. In a separate compartment, or half-cell, each half-reaction takes place alongside an electrode. The electrodes where oxidation and reduction happen are called the anode and cathode, respectively.
What sets voltaic cells apart from galvanic ones?
Galvanic (or voltaic) cells use a thermodynamically advantageous redox reaction to produce an electric current. Each half-reaction takes place next to an electrode in a distinct compartment, or half-cell. The anode and cathode, respectively, are the electrodes where reduction and oxidation occur.
Briefing:
For the oxidation half cell;
Al(s) -------> Al^3+(aq) + 3e.
For reduction half cell;
Cu^2+(aq) +2e ------> Cu(s).
E°cell = E°cathode - E°anode
But;
E°cathode= 0.34 V
E°anode = -1.66 V
E°cell= 0.34 -(-1.66)
E°cell= 2.0 V
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the half life of a radioactive substance is 1459 years. what is the annual decay rate? express the percent to 4 significant digits.
The relation between half-life and rate at which it is decaying is given by
t(1/2) = log2/rate
now in the above problem half-life is given as 1459 years substituting in the above equation we get the value of rate at which it is decaying to be rate=0.0001075.
The amount of substance that is present after t years given that the half-life of the substance is h is calculated through the equation,
A(t) = A(o)(0.5^t/h)
The 1/2-life of a radioactive isotope is the quantity of time it takes for one-1/2 of the radioactive isotope to decay. The half of-existence of a selected radioactive isotope is consistent; it's miles unaffected by using situations and is independent of the initial quantity of that isotope.
1/2-life (symbol t1⁄2) is the time required for an amount (of substance) to reduce to half of its initial price. The time period is commonly utilized in nuclear physics to explain how speedy volatile atoms undergo radioactive decay or how long strong atoms survive.
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subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain?
The subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain are two protons.
What is electron transport chain?
Electrons are transferred from one molecule to another in the electron transport chain and the energy released during these electron transfers is utilized to create an electrochemical gradient.
During the oxidative phosphorylation process, glucose molecules are stripped of their protons when two oxygen molecules are reduced to water using the electrons that have traveled through the electron transport chain. Once at the mitochondrial membrane, the protons are utilized to establish a proton gradient. By means of chemiosmosis, this gradient is utilized to propel the manufacturing of ATP.
Therefore the subatomic particles are removed from glucose and end up creating water at the end of the electron transport chain are two protons.
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yet, despite the similarity in their appeareance, these two substances differ greatly in their porperties, since one is a molecular solid and the other is an ionic solid. how do the properties differ and why?
Molecular solid have covalently bonded atoms in it whereas Ionic solid have electronic bonds between its atoms..
We employ the octet rule, which states that all atoms in a compound are expected to comply by, to confirm the accuracy of any chemical structure. Every atom in the carbon IV oxide model precisely complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons. We can therefore conclude that this structure is accurate given the total number of bonds and electrons, as well as the fact that CO₂ has sixteen valence electrons.
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Molar Mass Values
NaN3
65.02 g/mol
Na
22.99 g/mol
N₂
28.02 g/mol
KNO,
101.11 g/mol
If 45.97 grams of sodium is produced in reaction 1, how many of grams of
nitrogen will be then be produced in reaction 2?
10 Na(s) + 2 KNO,(s) →K₂O(s) + 5 Na₂O(s) + N₂(g)
In consideration of Henry's law the molar mass of organic compound is 0.24 grams.
What is molar mass?The molar mass of a chemical compound defined as the mass of a sample of that compound devided by the amount of substance which is the number of moles in that sample,measured in moles.
Sol-One of three asks what the mass of water is in grams and two and 1/2 liters of paper of Equis, 12.5% sodium chloride, fifty five°C. This problem tells us that pure H2O is one hundred eighteen tour at fifty five*° C.So the first thing that we have to do here is figure out wth e um, the mole fraction of thermal fractions, I suppose, of both sodium chloride and water.
We know those 2.5 liters. We're looking for this number of moles here. Ideal gas constant 0.8 to 6 leader atmospheres over mole Calvin. And then we have to convert, um, Celsius, the 55 degrees C to Calvin. So we always rmember that simply 55 degrees Celsius plus two year and 73 which gets US 328 Calvin. So solving all of that for the number of moles, then that gives us 0.133 off water and 2.5 liters of vapor. So last step, then, is to just convert that to Graham's, since the problem asks for a mass and not by the number moles. So you can plug that, , basically into, uh, the molecular by it it and it does weight of water, just 18.2 grand's for mold. And that gives us keeping significant figures in mind. 0.24 grams.
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the ground-state valence-shell configuration of a particular atom is 4d105s25p1. the element to which this atom belongs is a
The atomic number of indium is 49, and its electronic configuration is [Kr] 4d105s25p1. This atom is a member of the element that belongs to groups 13 and 5. The luster of indium is bright silvery-white.
What is the electron configuration of valence shell in the ground state?The least energetic and most stable configuration is the ground state configuration. A higher energy configuration is called an excited state configuration (it requires energy input to create an excited state). The electrons used in bonds are valence electrons.
Valence electrons: What are they?The electrons in an atom's outermost shell, or energy level, are called valence electrons. oxygen has 6 valence electrons two in the 2s subshell and four in the 2p subshell. The electron configuration of oxygen can be expressed as 2s22p4.
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How many molecules are in 24.0 g of
H₂SO4?
Explanation:
RFM=98g
1mol=6.022x10^23molecules
1mol=RFM
98g H2SO4=6.022x10^23molecules
24.0g H2SO4=?
24×6.022×10^23/98
=1.475×10^23 molecules
a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of water at 85 °c and the temperature of the two become equal. specific heat of water is 4.184 j/g°c. what is the final temperature when the two become equal.
T= 81.960C is the final temperature when the two become equal.a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of water at 85 °c and the temperature of the two become equal. specific heat of water is 4.184 j/g°c.
Natural environments do not contain pure aluminium. Beginning with bauxite ore, which is made up of hydrated aluminum oxide (40% to 60%) combined with silica and iron oxide, the manufacturing of primary aluminum metal can begin. For every 4 to 5 tonnes of bauxite ore, 2 tonnes of alumina are produced. Aluminum corrodes even if it doesn't rust. The metal is kept largely protected from corrosion by the aluminum oxide coating's high resistance and ability to repair itself after injury. It is well known for being both lightweight and flexible, making aluminum a very versatile metal with many benefits. built to accommodate a wide range of uses.We Know that Q= heat = mCp\DeltaT
where m= mass, Cp = heat capacity, \DeltaT = temperature difference The heat lost by hot fluid = heat gained by cold fluid
mhCph\DeltaT = mcCpc\DeltaT
where h and c denote hot(coffee)and cold(aluminium spoon) respectively. Heat capacity of water = 4.2 J(mole*K)= heat capacity of coffee(given), On substituting all the given terms:
180*4.2*(85-T) = 45*0.88*(T-24)
On Solving, T= 81.960C
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what is the Ka reaction of hcn? Ka reaction: the Ka of hcn is 6.2×10−10. what is the Kb value for cn− at 25 °c? Kb
The Ka of the reaction of HCN is 1.6x10^-5 when the Ka of hcn is 6.2×10−10 and value of Kb is 1.6x10^-5
Ka reaction of HCN is
HCN (aq) + H2O (l) H3O+ (aq) + CN- (aq)
Now, at 250 C
Ka × Kb = Kw = 10-14
Hence Kb of CN- ion is
Or, Kb = = 1.6 × 10-5 .
Kb is the measure of the basic strength.It determines the relative basic strength.Kb is the base dissociation constantKb is the base dissociation constant. How thoroughly a base separates into its constituent ions in water is determined by the base dissociation constant.pKb is the negative base-10 logarithm of the base dissociation constant (Kb) of a solution. It is used to determine the strength of a base or alkaline solution.To learn more about base dissociation constant visit:
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why is it necessary to determine the wavelength of maximum absorbance (aka λmax) of the copper sulfate solution before the absorbance of the five standard solutions and the unknown are measured
It is necessary to determine the wavelength of maximum absorbance (aka λmax) of the copper sulfate solution before the absorbance of the five standard solutions because this helps in getting the molar concentration of the unknown solution.
In the absorbance vs wavelength graph for a solution of copper sulfate notice that solutions absorb strongly from approximately 600 to 800 nm, with the maximum absorbance is around 750 nm. Thus in an experiment, we would choose a wavelength within that range. There is an vital distinction between the color of the light we observed reflected and the color the light absorbed. A wavelength of 750 nm indicates to red light, while a solution of copper sulfate appears to be blue. Copper sulfate solution reflects or transmits blue light, but absorbs red light.
Higher absorbance of the wavelength provides higher sensitivity observes at a wavelength of maximum absorbance (aka λmax) that helps to get the molar concentration of the unknown solution.
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