Question 1

Identify the conjugate base of HCO3-

Accepted Answer

A) H2CO3 
B) CO32- 
C) OH- 
D) CO2 
E) CO 
A) H2CO3 
B) CO32- 
C) OH- 
D) CO2 
E) CO

Question 2

A 5.2 L sample of a 1.1 M KOH solution is mixed with 2.3 L of a 0.20 M Sc(OH)3 solution.What is the pH of the mixture?

Accepted Answer

A) 13.67 
B) 13.89 
C) 14.11 
D) 14.23 
E) 13.98 
A) 13.67 
B) 13.89 
C) 14.11 
D) 14.23 
E) 13.98

Question 3

A 0.10 M NH3 solution is 1.3% ionized.Calculate the H+ ion concentration. NH3 + H2O    
NH4+ + OH-

Accepted Answer

A) 1.3 × 10-3 M 
B) 7.7 × 10-2 M 
C) 7.7 × 10-12 M 
D) 0.13 M 
E) 0.10 M 
A) 1.3 × 10-3 M 
B) 7.7 × 10-2 M 
C) 7.7 × 10-12 M 
D) 0.13 M 
E) 0.10 M

Question 4

Calculate the H+ ion concentration in a solution with a pH of 3.85.

Accepted Answer

Question 5

Consider the weak bases below and their Kb values:   Arrange the conjugate acids of these weak bases in order of increasing acid strength.

Accepted Answer

A) C5H5NH+ 6H7OH 2H5NH 
B) C6H7OH 5H5NH+ 2H5NH 
C) C5H5NH+ 2H5NH3+ 6H7OH 
D) C6H7OH 2H5NH3+5H5NH+ 
E) C2H5NH3+5H5NH+ 6H7OH 
A) C5H5NH+ 6H7OH 2H5NH 
B) C6H7OH 5H5NH+ 2H5NH 
C) C5H5NH+ 2H5NH3+ 6H7OH 
D) C6H7OH 2H5NH3+5H5NH+ 
E) C2H5NH3+5H5NH+ 6H7OH

Question 6

Consider the weak acid CH3COOH (acetic acid).If a 0.048 M CH3COOH solution is 5.2% ionized, determine the [H3O+] concentration at equilibrium.

Accepted Answer

A) 0.25 M 
B) 9.2 × 10-3 M 
C) 0.048 M 
D) 0.052 M 
E) 2.5 × 10-3 M 
A) 0.25 M 
B) 9.2 × 10-3 M 
C) 0.048 M 
D) 0.052 M 
E) 2.5 × 10-3 M

Question 7

Identify the conjugate acid-base pairs in the reaction HSO4- + HF    
H2SO4 + F-
 One conjugate acid-base pair is _______________; the other acid-base pair is ______________.

Accepted Answer

Question 8

What is the concentration of H+ in a 2.5 M HCl solution?

Accepted Answer

A) 0 
B) 1.3 M 
C) 2.5 M 
D) 5.0 M 
E) 10.M 
A) 0 
B) 1.3 M 
C) 2.5 M 
D) 5.0 M 
E) 10.M

Question 9

The pOH of a solution is 9.60.Calculate the hydrogen ion concentration in this solution.

Accepted Answer

A) 2.5 × 10-10 M 
B) 6.0 × 10-9 M 
C) 4.0 × 10-5 M 
D) 2.4 × 10-4 M 
E) 1.0 × 10-14 M 
A) 2.5 × 10-10 M 
B) 6.0 × 10-9 M 
C) 4.0 × 10-5 M 
D) 2.4 × 10-4 M 
E) 1.0 × 10-14 M

Question 10

What is the OH- ion concentration in a 5.2 × 10-4 M HNO3 solution?

Accepted Answer

A) 1.9 × 10-11 M 
B) 1.0 × 10-7 M 
C) 5.2 × 10-4 M 
D) 0 
E) 1.0 × 10-4 M 
A) 1.9 × 10-11 M 
B) 1.0 × 10-7 M 
C) 5.2 × 10-4 M 
D) 0 
E) 1.0 × 10-4 M

Question 11

Calculate the pH of a 0.14 M HNO2 solution that is 5.7% ionized.

Accepted Answer

A) 0.85 
B) 1.70 
C) 2.10 
D) 11.90 
E) 13.10 
A) 0.85 
B) 1.70 
C) 2.10 
D) 11.90 
E) 13.10

Question 12

Which of the following does not fit the definition of a Brønsted Base?

Accepted Answer

A) CO32- 
B) NH3 
C) H2O 
D) NH4+ 
E) HCO3- 
A) CO32- 
B) NH3 
C) H2O 
D) NH4+ 
E) HCO3-

Question 13

Rain collected on a remote island in the Pacific assumed to be unaffected by human pollution.The pH of the rainwater on this island was not 7.Do you expect the pH to be greater than 7 or less than 7? Explain your reasoning.

Accepted Answer

The pH is expected to be less

Question 14

Which of these acids is stronger, H3PO4 or H3AsO4?

Accepted Answer

Question 15

The pH of a 0.095 M solution of an unknown monoprotic acid is 5.42.Calculate the Ka of the acid.

Accepted Answer

A) 3.8 x 10-6 
B) 3.6 x 10-7 
C) 1.5 x 10-10 
D) 2.6 x 10-9 
E) 2.8 x 10-8 
A) 3.8 x 10-6 
B) 3.6 x 10-7 
C) 1.5 x 10-10 
D) 2.6 x 10-9 
E) 2.8 x 10-8

Question 16

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 × 105 m3 of water.If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Accepted Answer

A) 5.44 
B) 8.56 
C) 8.44 
D) 5.56 
E) 2.44 
A) 5.44 
B) 8.56 
C) 8.44 
D) 5.56 
E) 2.44

Question 17

Identify the conjugate base of HSO4 -

Accepted Answer

A) OH- 
B) H2SO4 
C) H2O 
D) H2SO3 
E) SO42- 
A) OH- 
B) H2SO4 
C) H2O 
D) H2SO3 
E) SO42-

Question 18

Which of the following yields an acidic solution when dissolved in water? I.NO2
 II.NH4Cl
III.NaCl
IV.HNO2

Accepted Answer

A) I and IV 
B) II and III 
C) I, II, and IV 
D) I and III 
E) I, II, III, and IV 
A) I and IV 
B) II and III 
C) I, II, and IV 
D) I and III 
E) I, II, III, and IV

Question 19

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

Accepted Answer

A) 3.74 
B) 4.98 
C) 6.53 
D) 9.02 
E) 10.25 
A) 3.74 
B) 4.98 
C) 6.53 
D) 9.02 
E) 10.25

Question 20

The salt hydrolysis reaction for NH4NO3 that represents the acidic or basic nature of the solution is:

Accepted Answer

A) NH4+(aq)+ H2O(l)     NH3(aq)+ H2(g)+ OH-(aq) 
B) NO3-(aq)+ H2O(l)     HNO3(aq)+ OH-(aq) 
C) NH4+(aq)+ H2O(l)     H3O+(aq)+ NH3(aq) 
D) NH4+(aq)+ NO3-(aq)     NH4NO3(aq) 
E) NO3-(aq)+ 3H2O(l)     HNO3(aq)+ 2H3O+(aq) 
A) NH4+(aq)+ H2O(l)     NH3(aq)+ H2(g)+ OH-(aq) 
B) NO3-(aq)+ H2O(l)     HNO3(aq)+ OH-(aq) 
C) NH4+(aq)+ H2O(l)     H3O+(aq)+ NH3(aq) 
D) NH4+(aq)+ NO3-(aq)     NH4NO3(aq) 
E) NO3-(aq)+ 3H2O(l)     HNO3(aq)+ 2H3O+(aq)

Exam 15: Acids and Bases

Identify the conjugate base of HCO3-

A 5.2 L sample of a 1.1 M KOH solution is mixed with 2.3 L of a 0.20 M Sc(OH)3 solution.What is the pH of the mixture?

A 0.10 M NH3 solution is 1.3% ionized.Calculate the H+ ion concentration. NH3 + H2O NH4+ + OH-

Calculate the H+ ion concentration in a solution with a pH of 3.85.

Consider the weak bases below and their Kb values: Arrange the conjugate acids of these weak bases in order of increasing acid strength.

Consider the weak acid CH3COOH (acetic acid).If a 0.048 M CH3COOH solution is 5.2% ionized, determine the [H3O+] concentration at equilibrium.

Identify the conjugate acid-base pairs in the reaction HSO4- + HF H2SO4 + F- One conjugate acid-base pair is _______________; the other acid-base pair is ______________.

What is the concentration of H+ in a 2.5 M HCl solution?

The pOH of a solution is 9.60.Calculate the hydrogen ion concentration in this solution.

What is the OH- ion concentration in a 5.2 × 10-4 M HNO3 solution?

Calculate the pH of a 0.14 M HNO2 solution that is 5.7% ionized.

Which of the following does not fit the definition of a Brønsted Base?

Rain collected on a remote island in the Pacific assumed to be unaffected by human pollution.The pH of the rainwater on this island was not 7.Do you expect the pH to be greater than 7 or less than 7? Explain your reasoning.

Which of these acids is stronger, H3PO4 or H3AsO4?

The pH of a 0.095 M solution of an unknown monoprotic acid is 5.42.Calculate the Ka of the acid.

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 × 105 m3 of water.If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Identify the conjugate base of HSO4 -

Which of the following yields an acidic solution when dissolved in water? I.NO2 II.NH4Cl III.NaCl IV.HNO2

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

The salt hydrolysis reaction for NH4NO3 that represents the acidic or basic nature of the solution is:

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Identify the conjugate base of HCO₃^-

A 5.2 L sample of a 1.1 M KOH solution is mixed with 2.3 L of a 0.20 M Sc(OH)₃ solution.What is the pH of the mixture?

A 0.10 M NH₃ solution is 1.3% ionized.Calculate the H⁺ ion concentration. NH₃ + H₂O NH₄⁺ + OH^-

Calculate the H⁺ ion concentration in a solution with a pH of 3.85.

Consider the weak bases below and their K_b values: Arrange the conjugate acids of these weak bases in order of increasing acid strength.

Consider the weak acid CH₃COOH (acetic acid).If a 0.048 M CH₃COOH solution is 5.2% ionized, determine the [H₃O⁺] concentration at equilibrium.

Identify the conjugate acid-base pairs in the reaction HSO₄^- + HF H₂SO₄ + F^- One conjugate acid-base pair is _; the other acid-base pair is .

What is the concentration of H⁺ in a 2.5 M HCl solution?

What is the OH^- ion concentration in a 5.2 × 10^-4 M HNO₃ solution?

Calculate the pH of a 0.14 M HNO₂ solution that is 5.7% ionized.

Which of these acids is stronger, H₃PO₄ or H₃AsO₄?

The pH of a 0.095 M solution of an unknown monoprotic acid is 5.42.Calculate the K_a of the acid.

Due to a highway accident, 150 L of concentrated hydrochloric acid (12.0 M)is released into a lake containing 5.0 × 10⁵ m³ of water.If the pH of this lake was 7.0 prior to the accident, what is the pH of the lake following the accident?

Identify the conjugate base of HSO₄^-

Which of the following yields an acidic solution when dissolved in water? I.NO₂ II.NH₄Cl III.NaCl IV.HNO₂

What is the pH of a 0.20 M solution of NH₄Cl? [K_b(NH₃)= 1.8 × 10^-5]

The salt hydrolysis reaction for NH₄NO₃ that represents the acidic or basic nature of the solution is: