We are given that the concentration of NaOH is 0.0003 M and are asked to calculate the pH
We know that NaOH dissociates by the following reaction:
NaOH → Na⁺ + OH⁻
Which means that one mole of NaOH produces one mole of OH⁻ ion, which is what we care about since the pH is affected only by the concentration of H⁺ and OH⁻ ions
Now that we know that one mole of NaOH produces one mole of OH⁻, 0.0003M NaOH will produce 0.0003M OH⁻
Concentration of OH⁻ (also written as [OH⁻]) = 3 * 10⁻⁴
pOH of the solution:
pOH = -log[OH⁻] = -log(3 * 10⁻⁴)
pOH = -0.477 + 4
pOH = 3.523
pH of the solution:
We know that the sum of pH and pOH of a solution is 14
pH + pOH = 14
pH + 3.523 = 14 [subtracting 3.523 from both sides]
pH = 10.477
49. What is the Atomic Mass of Magnesium on the Reaction Side of this chemical equation? Mg + Cl2 MgCl2 ? g 719 95.3g
Answer:
[tex]molar \: mass = 24g[/tex]
Which is hoped to be a positive effect of global warming for society?
Someone please help!
Answer:
Warm Springs temperature
Explanation:
When the common ion effect is in action, the equilibrium of a system will shift to: Select the correct answer below:
a. decrease the amount of the common ion in the system
b. increase the amount of the common ion in the system
c. depends on the ion
d. The system will not shift at all.
Answer:
a. decrease the amount of the common ion in the system
Explanation:
The correct option is - a. decrease the amount of the common ion in the system
Reason -
Adding a common ion decreases solubility, as the reaction shifts toward the left to relieve the stress of the excess product.
Adding a common ion to a dissociation reaction causes the equilibrium to shift left, toward the reactants, causing precipitation.
Which is compound formed from a metal cation and nonmetal anion?
Carbon dioxide
Carbon monoxide
Potassium chloride
Diphosphours pentoxide
The equation shows neutralization of an acid and a base to produce a salt and water
Answer:
tRUE??
Explanation:
Steven placed an ice cream scoop under hot water before scooping ice cream. Which describes how the ice cream scoop was affected
Answer: Okay so i don't know how i can explain this but.. OK so Steven placed an ice cream scoop right? and put it under hot water so i would say it would make the ice cream scoop hot? and then using it to scoop the ice cream i could say it would be a melting affection i think
Explanation:
im am so sorry pls forgive me is i am wrong i tried my best so at least give me a like for effort.. i hope u have a great day :)
why does methane exist as a gas and nonane exist as liquid
Answer:
Molecular weight
Explanation:
The difference in the physical state of nonane vs methane at STP. Methane is a very small molecule with a molecular weight of 16 g/mol. It exists as a gas at standard temperature and pressure. Nonane is a much larger molecule with a molecular weight of 128.2 g/mol. It exists as a liquid at standard temperature and pressure.
All gasses at STP are Made of small molecular weight molecules. The smaller a molecule, the more movement the individual atoms have. The increased movement of smaller molecules allows them to have more space between individual molecules. The increased molecular motion and space between molecules is one of the main differences between a gas versus a liquid or solid. The larger nonane molecules have less molecular motion and so are can be closer together and so exist as a liquid instead of a gas.
(02.02 LC) The two main types of weathering are Select one:
a. mechanical and physical
b. physical and kinetic
c. chemical and physical
d. chemical and acidic
Answer:
d
Explanation:
Answer:
c. chemical and physical
Explanation:
hope this helps! :)
Question 8 of 10
Why is it important for scientists to use the scientific method?
A. The scientific method helps scientists get accurate,
repeatable results.
B. Experiments would not produce any data without the
scientific method.
C. Scientists would not ask questions if the scientific
method were not used.
D. Using the scientific method means that the results
will support the hypothesis.
why silicon exist as solid at room temperature while chlorine exist as gas ?
Answer:
Hello Dear!..Explanation:
CO2 consists of individual molecules with one central carbon atom double bonded to two oxygen atoms. Silicon does not form double bonds with oxygen. ... because of this reason co2 is gas but sio2 is solid.
Hope that helps you Buddy ...
Take care...
Buhbye!
This equation is not balanced. Click on the coefficient we should change first.
help ASAP
Answer: The coefficient we should change first is for [tex]NO_{3}[/tex].
Explanation:
The given reaction equation is as follows.
[tex]Al + Ni(NO_{3})_{2} \rightarrow Al(NO_{3})_{3} + Ni[/tex]
Here, number of atoms present on reactant side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 2Number of atoms present on the product side are as follows.
Al = 1Ni = 1[tex]NO_{3}[/tex] = 3To balance this equation, multiply Al by 2 and [tex]NO_{3}[/tex] by 3 on reactant side. Also, multiply [tex]Al(NO_{3})_{3}[/tex] by 2 and Ni by 3 on the product side.
Hence, the equation can be rewritten as follows.
[tex]2Al + 3Ni(NO_{3})_{2} \rightarrow 2Al(NO_{3})_{3} + 3Ni[/tex]
Now, number of atoms present on reactant side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Number of atoms present on product side are as follows.
Al = 2Ni = 3[tex]NO_{3}[/tex] = 6Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.
Thus, we can conclude that the coefficient we should change first is for [tex]NO_{3}[/tex].
This equation is not balanced. Click on the coefficient we should change first.
help
please
Directions: Decode the words using the clue. The definition of each word is
also given to help you identify the words.
D
F
н
K
X
L
Y
N
P
R
$
V
N
1. ZBYRPHYRF - smallest particle in a chemical element or compound
Anger
Answer:
cause it has more
space between molecules.
O C. Ice has a higher density than li
Explanation:
A ______ is a hole where the steam looks a lot like a smoke
A DRY ICE is hole were the steam looks a lot a smoke
How many grams are in 2.0 x 10-5 moles of uranium?
What are the reactants and products of a redox reaction, neutralization reactions, and precipitation reactions?
Answer:
Precipitation reactions are ones in which at least one of the reactants is in the aqueous phase (i.e., dissolved in water), and a solid forms on the product side which was not present on the reactant side. If all the reactants are solid, then a solid product forming should not be called a precipitate. To be called a precipitate, an insoluble product must form from within solution, either from a solid and solute interacting, or from an interaction strictly between solutes.
Explanation:
What sort of fossils would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole?
Answer:
Antarctic Peninsula, is one of the most important fossil sites on Earth.
hope this helps you ☺️☺️
Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
What are fossils?Fossils are the preserved remains, impression, or trace of any once-living thing from many years ago. Examples of the fossils include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants.
There are four different types of fossils-
Mold fossils
Cast fossils
Trace fossils or Ichnofossils
True form fossils
Imprints, tracks, and trails can also become fossilized and are called Trace fossils. Dinosaur footprints or worm burrows are the examples.
Living things when get decomposed from the so many years ago and become dirt and rocks are fossils.
Therefore, Fossils that would be expected to be found in Antarctica from more recent times, after it had moved much closer to the South Pole is Antartica peninsula.
Learn more about Fossils, here:
https://brainly.com/question/14988327
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a substance that is found naturally in the Earth and that does not contain plant or animal matter. Gold is an example.
Answer:
COPPER , SILVER, GRAPHITE, WATER , POTASSIUM , LEAD AND .........ETC
Explanation:
In an aqueous chloride solution cobalt(II) exists in equilibrium with the complex ion CoCl42-. Co2 (aq) is pink and CoCl42-(aq) is blue. At Low Temperature the pink color pre-dominates. At High Temperature the blue color is strong. If we represent the equilibrium as:
CoCl4^2-(aq) <--> Co2+(aq) + 4Cl-(aq)
We can conclude that:___.
1. This reaction is:___.
A. Exothermic
B. Endothermic
C. Neutral
2. When the temperature is decreased the equilibrium constant, K:____.
A. Increases
B. Decreases
C. Remains the same.
3. When the temperature is decreased the equilibrium concentration of Co2:______.
A. Increases
B. Decreases
C. Remains the same.
Answer:
1. This reaction is (A) Exothermic .
2. When the temperature is decreased the equilibrium constant, K: (A) Increases
3.When the temperature is decreased the equilibrium concentration of Co2: (A) Increases
Explanation:
[tex]CoCl4^2-(aq) <--> Co_2+(aq) + 4Cl^-(aq)[/tex]
1. The pink color predominates at low temperatures, indicating that the commodity is preferred.
This is a reaction that is exothermic.
2. As the decrease in the temperature , the equilibrium constant , K ;
equilibrium constant = [tex]\frac{product}{reactant}[/tex] =[tex]\frac{[CO^2^+][Cl^-^4]}{CoCl^2^-_4}[/tex]
As the temperature drops, the concentration of[tex]Cl^-[/tex] and [tex]CO^2^+[/tex] rises, and K rises as well , thus it increases .
3. The equilibrium concentration of [tex]CO^2^+[/tex] decreases as the temperature decreases:
When the temperature is lowered, the equilibrium shifts to the right , that is it increases.
27.5 mL of a 0.235 M potassium hydroxide solution is required to completely react with 35.0 mL of a sulfuric acid solution. Provide the balanced chemical equation for this reaction and determine the concentration of the sulfuric acid solution.
Answer: The balanced equation is [tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex] and the concentration of the sulfuric acid solution is 0.184 M.
Explanation:
Given: [tex]V_{1}[/tex] = 27.5 mL, [tex]M_{1}[/tex] = 0.235 M
[tex]V_{2}[/tex] = 35.0 mL, [tex]M_{2}[/tex] = ?
Formula used to calculate the concentration of the sulfuric acid solution is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.235 M \times 27.5 mL = M_{2} \times 35.0 mL\\M_{2} = \frac{0.235 M \times 27.5 mL}{35.0 mL}\\= 0.184 M[/tex]
The given chemical equation for given reaction is as follows.
[tex]KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + H_{2}O[/tex]
Number of atoms on reactant side are as follows.
K = 1H = 2[tex]SO_{4}[/tex] = 1O = 1Number of atoms on product side are as follows.
K = 2H = 2[tex]SO_{4}[/tex] = 1O = 1To balance this equation, multiply KOH by 2 on reactant side and multiply [tex]H_{2}O[/tex] by 2. Hence, the equation can be rewritten as follows.
[tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex]
Now, number of atoms on reactant side are as follows.
K = 2H = 4[tex]SO_{4}[/tex] = 1O = 2Number of atoms on product side are as follows.
K = 2H = 4[tex]SO_{4}[/tex] = 1O = 2Since, there are same number of atoms of both reactant and products. Therefore, the equation is now balanced.
Thus, we can conclude that the balanced equation is [tex]2KOH + H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2H_{2}O[/tex] and the concentration of the sulfuric acid solution is 0.184 M.
What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of.
Answer:
I think u understand this answers
2H2 + O2 = 2H2O is a neutralization or non-neutralization reaction? And explain why..
Is vinegar acidic, alkaline or neutral?
Answer:
Substances over 7 are categorized as basic, with 7 being the neutral point. Water has a pH level of 7. Substances with pH levels under 7 are categorized as acidic. Vinegar is acidic.
Explanation:
You can change it a little if you want. Hope this helps!
Vinegar is acidic. The only vinegar that has alkaline is apple cider vinegar, but all types of vinegar are acidic.
Why do scientists track virus mutations and how might tracking these variants be helpful in preventing and treating the virus?
Answer: they do this because if they do they can easily find new viruses to stay safe from
Explanation: i took test on it recentley
Which substance has the higher boiling point: CH3CH2CH2CH3 or CH3CH2CH2CH2CH3? Explain.
n-pentane
Explanation:
The longer the alkyl chain, the greater the opportunity for Van der Waals interactions between chains. Thus as the chain length increases, the boiling point increases
An electrochemical cell is made up of an Zn2+/Zn half-cell and an Ag+/Ag half-cell. If the mass deposited at the silver electrode is 0.50 g, calculate the mass lost at the zinc electrode.
Answer:
hi how are you doing today Jasmine
3. Which of the following affects the angle at which the sun's rays hit Earth?
a. weather
b. latitude
c. sea level
d. wind
Answer:weather
Explanation:
Question 3 of 20 :
Select the best answer for the question.
3. The atomic number of niobium (Nb) is 41. What's the electron configuration for Nb?
O A. [Ar] 3s 4p?
O B. [Kr] 5s? 5p
O C. [Kr] 4d45s
O D. (Ne) 4d
Answer:
[Kr] 4d4 5s1
Explanation:
Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Neutron Number and Mass Number of Niobium Mass numbers of typical isotopes of Niobium are 93.
Name of Element : Niobium
Atomic Weight : 92.9
Atomic Number : 41
Group : Transition Elements
Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d3
For a lake in Michigan, researchers have determined that largemouth bass feed on smaller fish, which in turn feed on zooplankton. In 2016, there was 600,000 kg of zooplankton in the lake. In 2017, an accidental runoff of insecticide near the lake caused a 50 percent decline of the zooplankton population in the lake. Assuming 10 percent trophic efficiencies, what is the expected decline in largemouth bass?
(a) 1,000 mg.
(b) 1,500 kg.
(c) 2,000 kg.
(d) 3,000 kg.
Answer:
the expected decline in largemouth bass is 3,000 kg.
Option d) 3,000 kg is the correct answer.
Explanation:
Given the data in the question;
In 2016, there was 600,000 kg of zooplankton in the lake.
In 2017, an accidental runoff of insecticide near the lake caused a 50 percent decline of the zooplankton population in the lake.
Now,
The remaining mass of zooplankton after the 50% decline will be;
⇒ 600,000 kg zooplankton × 50%
⇒ 600,000 × 50/100
⇒ 300,000 kg of zooplankton
Now, with 10 percent trophic efficiency; smaller fish directly feed on zooplankton; decline in smaller fish mass will be;
⇒ 300,000 kg × 10%
⇒ 300,000 × 10/100
⇒ 30000 kg
Finally, with 10 percent trophic efficiency, largemouth bash directly feed on smaller fish, so the expected decline in mass of largemouth bash will be;
⇒ 30000 kg × 10%
⇒ 30000 kg × 10/100
⇒ 3,000 kg
Therefore, the expected decline in largemouth bass is 3,000 kg.
Option d) 3,000 kg is the correct answer.