Question 1

Calculate the pOH of a solution at 25.0 °C that contains 2.95 × 10-12 M hydronium ions.

Accepted Answer

A) 12.00 
B) 2.95 
C) 7.00 
D) 2.47 
E) 11.53 
A) 12.00 
B) 2.95 
C) 7.00 
D) 2.47 
E) 11.53

Question 2

The conjugate base of HPO42- is ________.

Accepted Answer

A) PO43- 
B) H2PO4 
C) H3PO4 
D) H2PO4- 
E) none of the above 
A) PO43- 
B) H2PO4 
C) H3PO4 
D) H2PO4- 
E) none of the above

Question 3

In the reaction
BF3 + F- → BF4-
BF3 acts as a Br∅nsted-Lowry acid.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following aqueous solutions has the highest [OH-]?

Accepted Answer

A) a solution with a pH of 3.0 
B) a 1 × 10-4 M solution of HN   
C) a solution with a pOH of 12.0 
D) pure water 
E) a 1 × 10-3 M solution of N   Cl 
A) a solution with a pH of 3.0 
B) a 1 × 10-4 M solution of HN   
C) a solution with a pOH of 12.0 
D) pure water 
E) a 1 × 10-3 M solution of N   Cl

Question 5

In acidic solution,________.

Accepted Answer

A) [H3O+] > [OH-] 
B) [H3O+] = [OH-] 
C) [H3O+] -] 
D) [O   ] > 7.00 
E) [     ] = 0M 
A) [H3O+] > [OH-] 
B) [H3O+] = [OH-] 
C) [H3O+] -] 
D) [O   ] > 7.00 
E) [     ] = 0M

Question 6

Which of the following acids will be the strongest?

Accepted Answer

A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H2SeO4 
E) HSO3- 
A) H2SO4 
B) HSO4- 
C) H2SO3 
D) H2SeO4 
E) HSO3-

Question 7

The Ka of hypochlorous acid (HClO)is 3.0 × 10-8 at   .What is the percent ionization of hypochlorous acid in a   aqueous solution of HClO at

Accepted Answer

A) 4.5 × 10-8 
B) 14 
C) 2.1 × 10-5 
D) 0.14 
E) 1.4 × 10-3 
A) 4.5 × 10-8 
B) 14 
C) 2.1 × 10-5 
D) 0.14 
E) 1.4 × 10-3

Question 8

What is the pOH of an aqueous solution at 25.0 °C that contains 1.35 × 10-8 M hydroxide ion?

Accepted Answer

A) 6.13 
B) 7.87 
C) 1.35 
D) 8.00 
E) 7.00 
A) 6.13 
B) 7.87 
C) 1.35 
D) 8.00 
E) 7.00

Question 9

What is the pH of an aqueous solution at 25.0 °C that contains 1.35 × 10-8 M hydroxide ion?

Accepted Answer

A) 7.87 
B) 8.00 
C) 6.13 
D) 1.35 
E) 7.00 
A) 7.87 
B) 8.00 
C) 6.13 
D) 1.35 
E) 7.00

Question 10

Which one of the following statements regarding Kw is false?

Accepted Answer

A) pKw is 14.00 at 25 °C. 
B) The value of Kw is always 1.0 × 10-14. 
C) Kw changes with temperature. 
D) The value of Kw shows that water is a weak acid. 
E) Kw is known as the ion product of water. 
A) pKw is 14.00 at 25 °C. 
B) The value of Kw is always 1.0 × 10-14. 
C) Kw changes with temperature. 
D) The value of Kw shows that water is a weak acid. 
E) Kw is known as the ion product of water.

Question 11

The   of hydrofluoric acid (HF)at 25.0 °C is 6.8 ×   .What is the pH of a 0.45 M aqueous solution of HF?

Accepted Answer

A) 4.05 
B) 1.76 
C) 3.64 
D) 0.35 
E) 1.41 
A) 4.05 
B) 1.76 
C) 3.64 
D) 0.35 
E) 1.41

Question 12

What is the conjugate acid of HCO3-?

Accepted Answer

A) CO22- 
B) H2CO3 
C) HCO22- 
D) CO32- 
E) none of the above 
A) CO22- 
B) H2CO3 
C) HCO22- 
D) CO32- 
E) none of the above

Question 13

HZ is a weak acid.An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.The pH of the solution was 4.93 at 25.0 °C.The Ka of HZ is ________.

Accepted Answer

A) 1.2 × 10-5 
B) 6.9 × 10-9 
C) 1.4 × 10-10 
D) 9.9 × 10-2 
E) 2.8 × 10-12 
A) 1.2 × 10-5 
B) 6.9 × 10-9 
C) 1.4 × 10-10 
D) 9.9 × 10-2 
E) 2.8 × 10-12

Question 14

Which of the following ions will act as a strong base in water?

Accepted Answer

A) HS- 
B) F- 
C) NO2- 
D) ClO- 
E) None of the above will act as a strong base in water. 
A) HS- 
B) F- 
C) NO2- 
D) ClO- 
E) None of the above will act as a strong base in water.

Question 15

The Ka of hypochlorous acid (HClO)is   What is the pH at 25.0 °C of an aqueous solution that is   in

Accepted Answer

A) +2.45 
B) -2.45 
C) -9.22 
D) +9.22 
E) +4.61 
A) +2.45 
B) -2.45 
C) -9.22 
D) +9.22 
E) +4.61

Question 16

Of the following,________ is a weak acid.

Accepted Answer

A) HF 
B) HCl 
C) HBr 
D) HNO3 
E) HClO4 
A) HF 
B) HCl 
C) HBr 
D) HNO3 
E) HClO4

Question 17

A- is a weak base.Which equilibrium corresponds to the equilibrium constant Ka for HA?

Accepted Answer

A) HA (aq)+ H2O (l)   H2A+ (aq)+ OH- (aq) 
B) A- (aq)+ H3O+ (aq)   HA (aq)+ H2O (l) 
C) HA (aq)+ H2O (l)   H3O+ (aq)+ A- (aq) 
D) A- (aq)+ H2O (l)   HA (aq)+ OH- (aq) 
E) A- (aq)+ OH- (aq)   HOA2- (aq) 
A) HA (aq)+ H2O (l)   H2A+ (aq)+ OH- (aq) 
B) A- (aq)+ H3O+ (aq)   HA (aq)+ H2O (l) 
C) HA (aq)+ H2O (l)   H3O+ (aq)+ A- (aq) 
D) A- (aq)+ H2O (l)   HA (aq)+ OH- (aq) 
E) A- (aq)+ OH- (aq)   HOA2- (aq)

Question 18

Of the following acids,________ is not a strong acid.

Accepted Answer

A) HNO2 
B) H2SO4 
C) HNO3 
D) HClO4 
E) HCl 
A) HNO2 
B) H2SO4 
C) HNO3 
D) HClO4 
E) HCl

Question 19

The   for   is   What is the pH of a 0.0787 M aqueous NaA solution at 25.0 °C?

Accepted Answer

A) 9.33 
B) 10.00 
C) 5.21 
D) 1.10 
E) 8.79 
A) 9.33 
B) 10.00 
C) 5.21 
D) 1.10 
E) 8.79

Exam 16: Acid-Base Equilibria

Calculate the pOH of a solution at 25.0 °C that contains 2.95 × 10-12 M hydronium ions.

The conjugate base of HPO42- is ________.

In the reaction BF3 + F- → BF4- BF3 acts as a Br∅nsted-Lowry acid.

Which of the following aqueous solutions has the highest [OH-]?

In acidic solution,________.

Which of the following acids will be the strongest?

The Ka of hypochlorous acid (HClO)is 3.0 × 10-8 at .What is the percent ionization of hypochlorous acid in a aqueous solution of HClO at

What is the pOH of an aqueous solution at 25.0 °C that contains 1.35 × 10-8 M hydroxide ion?

What is the pH of an aqueous solution at 25.0 °C that contains 1.35 × 10-8 M hydroxide ion?

Which one of the following statements regarding Kw is false?

The of hydrofluoric acid (HF)at 25.0 °C is 6.8 × .What is the pH of a 0.45 M aqueous solution of HF?

What is the conjugate acid of HCO3-?

HZ is a weak acid.An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.The pH of the solution was 4.93 at 25.0 °C.The Ka of HZ is ________.

Which of the following ions will act as a strong base in water?

The Ka of hypochlorous acid (HClO)is What is the pH at 25.0 °C of an aqueous solution that is in

Of the following,________ is a weak acid.

A- is a weak base.Which equilibrium corresponds to the equilibrium constant Ka for HA?

Of the following acids,________ is not a strong acid.

The for is What is the pH of a 0.0787 M aqueous NaA solution at 25.0 °C?

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Calculate the pOH of a solution at 25.0 °C that contains 2.95 × 10^-12 M hydronium ions.

The conjugate base of HPO₄^2- is ________.

In the reaction BF₃ + F^- → BF₄^- BF₃ acts as a Br∅nsted-Lowry acid.

Which of the following aqueous solutions has the highest [OH^-]?

The K_a of hypochlorous acid (HClO)is 3.0 × 10^-8 at .What is the percent ionization of hypochlorous acid in a aqueous solution of HClO at

What is the pOH of an aqueous solution at 25.0 °C that contains 1.35 × 10^-8 M hydroxide ion?

What is the pH of an aqueous solution at 25.0 °C that contains 1.35 × 10^-8 M hydroxide ion?

Which one of the following statements regarding K_w is false?

What is the conjugate acid of HCO₃^-?

HZ is a weak acid.An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.The pH of the solution was 4.93 at 25.0 °C.The K_a of HZ is ________.

The K_a of hypochlorous acid (HClO)is What is the pH at 25.0 °C of an aqueous solution that is in

A- is a weak base.Which equilibrium corresponds to the equilibrium constant K_a for HA?