1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Aleks04 [339]
3 years ago
8

What is the ph of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 x 10^-5]

Chemistry
2 answers:
Pavlova-9 [17]3 years ago
8 0

"NH4+ <----> NH3 + H+  

The constant of this equilibrium is: K = Kw / Kb = 1 x 10^-14 / 1.8 x 10^-5 =5.56 x 10^-10  

5.56 x 10^-10 = x^2 / 0.20-x  

x = [H+] =1.1 x 10^-5 M  

pH = 5.0"

ad-work [718]3 years ago
5 0

Answer:

5.0

Explanation:

NH₄Cl is a strong electrolyte that ionizes according to the following equation.

NH₄Cl(aq) → NH₄⁺(aq) + Cl⁻(aq)

NH₄⁺ is a weak acid according to the following equation.

NH₄⁺(aq) ⇄ NH₃(aq) + H⁺(aq)

Given Kb for NH₃, we can calculate the Ka for NH₄⁺.

Ka. Kb = Kw

Ka = Kw / Kb = 10⁻¹⁴/1.8 × 10⁻⁵ = 5.6 × 10⁻¹⁰

For a weak acid, we can find [H⁺] using the following expression.

[H⁺] = √(Ca × Ka) = √(0.20 × 5.6 × 10⁻¹⁰) = 1.1 × 10⁻⁵ M

where,

Ca: concentration of the acid

The pH is

pH = -log [H⁺] = -log 1.1 × 10⁻⁵ = 5.0

You might be interested in
given two equations representing reactions: which type of reaction is represented by each of these equations?
Sergeeva-Olga [200]

Answer:

Equation 1 - nuclear fission

Equation 2 - nuclear fusion

Explanation:

Nuclear fission is a reaction in which a large nucleus is split into smaller nuclei when it is bombarded by neutrons. The process produces more neutrons to continue the chain reaction. This is clearly depicted in equation 1 as shown in the question.

Nuclear fusion is a reaction in which two light nuclei combine in order to form a larger nuclei. This is clearly depicted in equation 2 as shown in the question.

7 0
3 years ago
I don't know which the correct answer it is ???
Virty [35]
When I answered i got D
4 0
3 years ago
An increase in temperature results in A) a decrease in the required activation energy while the reaction rate remains constant.
N76 [4]

Answer:

C) an increase in rate of reaction because reactant molecules collide with greater energy

Explanation:

Temperature is one of the factors that affect the rate of a reaction. The rate of a reaction increases with an increase in temperature and vice versa. When the temperature of a reaction increases, the kinetic energy of the reactant molecules increases causing them to react at a faster rate.

The reactant molecules respond to an increase in temperature by colliding at a faster rate due to an increased kinetic energy between the reactant molecules.

7 0
3 years ago
Examination of the first few successive ionization energies for a given element usually reveals a large jump between two ionizat
gladu [14]

Answer:

See Explanation

Explanation:

Ionization energy refers to the energy required to remove an electron from an atom. Metals have lower ionization energy than non metals since ionization energy increases across a period.

One thing that we must have in mind is that it takes much more energy to remove an electron from an inner filled shell than it takes to remove an electron from an outermost incompletely filled shell.

Now let us consider the case of magnesium which has two outermost electrons. Between IE2 and IE3 we have now moved to an inner filled shell(IE3 refers to removal of electrons from the inner second shell) and a lot of energy is required to remove an electron from this inner filled shell, hence the jump.

For aluminium having three outermost electrons, there is a jump between IE3 and IE4 because IE4 deals with electron removal from a second inner filled shell and a lot of energy is involved in the process hence the jump.

Hence a jump occurs each time electrons are removed from an inner filled shell.

7 0
3 years ago
What is the difference between the mass number for carbon- 14 and carbon's atomic number of 12.011 amu
Dennis_Churaev [7]
Great question, but I believe you are mixing up atomic number with mass number. Assuming you are, 12.011 amu is the average mass of a carbon atom. For carbon, it can come in three forms: carbon-12, carbon-13, carbon-14. The number following carbon is the mass number of that particular carbon "isotope". The reason the average is so close to 12 is because carbon-12 is by far the most common, so the average should be (and is) very close to 12. Therefore, 12.011 is a weighted average of all carbon molecules, and carbon-14 is a particular carbon molecule that weighs 14 amu. 
7 0
3 years ago
Other questions:
  • 1. Which processes are taking place in the system represented by the following equation?
    14·1 answer
  • Which element has the greatest electronegativity?
    8·1 answer
  • A 5.0 l flask containing o2 at 2.00 atm is connected to a 3.0 l flask containing h2 at 4.00 atm and the gases are allowed to mix
    12·1 answer
  • What is an example of radioactive decay
    7·1 answer
  • Which of the following is a good definition of matter?
    14·2 answers
  • How many grams of lead(II) sulfate (303 g/mol) are needed to react with sodium chromate (162 g/mol) in order to produce 0.162 kg
    6·1 answer
  • Law of conservation of Mass states that all chemicals equations have to be balanced .
    11·1 answer
  • B) At what pH is H2 at 10 atm at equilibrium with this solution and pure nickel?
    13·1 answer
  • How many eggs are in 1 mole of eggs?
    6·1 answer
  • Please help
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!