Question 1

The   of hypochlorous acid (HClO)is 3.0 ×   at 25.0 °C.Calculate the pH of a   hypochlorous acid solution.

Accepted Answer

A) 3.05 
B) 9.53 
C) 4.47 
D) 6.52 
E) -3.05 
A) 3.05 
B) 9.53 
C) 4.47 
D) 6.52 
E) -3.05

Question 2

The hydride ion,   ,is a stronger base than the hydroxide ion,O   .The product(s)of the reaction of hydride ion with water is/are ________.

Accepted Answer

A) H3O+ (aq) 
B) OH- (aq)+ H2 (g) 
C) OH- (aq)+ 2H+ (aq) 
D) no reaction occurs 
E) H2O2 (aq) 
A) H3O+ (aq) 
B) OH- (aq)+ H2 (g) 
C) OH- (aq)+ 2H+ (aq) 
D) no reaction occurs 
E) H2O2 (aq)

Question 3

Ammonia is a ________.

Accepted Answer

A) weak acid 
B) strong base 
C) weak base 
D) strong acid 
E) salt 
A) weak acid 
B) strong base 
C) weak base 
D) strong acid 
E) salt

Question 4

Of the following,which is the weakest acid?

Accepted Answer

A) HPO3- 
B) H3PO4 
C) H2PO4- 
D) HPO4- 
E) The acid strength of all of the above is the same. 
A) HPO3- 
B) H3PO4 
C) H2PO4- 
D) HPO4- 
E) The acid strength of all of the above is the same.

Question 5

Using the data in the table,which of the conjugate bases below is the weakest base?

Accepted Answer

A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2- 
A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2-

Question 6

Ka for arsenic acic,HAsO42-,is 7.5 × 10-12.What is the pH of a 0.15 M aqueous solution of AsO43-?

Accepted Answer

A) 7.97 
B) 12.10 
C) 8.04 
D) 1.96 
E) 6.00 
A) 7.97 
B) 12.10 
C) 8.04 
D) 1.96 
E) 6.00

Question 7

The   of citric acid is 1.9 ×   at 25.0 °C.What is the pH of a 0.35 M aqueous solution of citric acid?

Accepted Answer

A) 0.46 
B) 2.59 
C) 5.23 
D) -3.46 
E) 2.13 
A) 0.46 
B) 2.59 
C) 5.23 
D) -3.46 
E) 2.13

Question 8

Of the following,which is the strongest acid?

Accepted Answer

A) HClO 
B) HClO3 
C) HClO2 
D) HClO4 
E) HIO 
A) HClO 
B) HClO3 
C) HClO2 
D) HClO4 
E) HIO

Question 9

What is the pOH of a 0.030 M solution of calcium hydroxide?

Accepted Answer

A) 12.78 
B) 1.22 
C) 12.48 
D) 10.41 
E) 1.52 
A) 12.78 
B) 1.22 
C) 12.48 
D) 10.41 
E) 1.52

Question 10

The acid-dissociation constants of sulfurous acid (H2SO3)are Ka1 = 1.7 × 10-2 and   at 25.0 °C.Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

Accepted Answer

A) 4.53 
B) 1.28 
C) 1.86 
D) 6.21 
E) 1.93 
A) 4.53 
B) 1.28 
C) 1.86 
D) 6.21 
E) 1.93

Question 11

An aqueous basic solution has a concentration of 0.050 M and Kb is 4.4 × 10-4.What is the concentration of hydronium ion in this solution (M)?

Accepted Answer

A) 2.2 × 10-13 
B) 2.2 × 10-12 
C) 2.9 × 10-13 
D) 0.050 
E) 4.5 × 10-13 
A) 2.2 × 10-13 
B) 2.2 × 10-12 
C) 2.9 × 10-13 
D) 0.050 
E) 4.5 × 10-13

Question 12

An aqueous solution contains 0.390 M HCl at 25.0 °C.The pH of the solution is ________.

Accepted Answer

A) 0.41 
B) 0.390 
C) 13.61 
D) 13.59 
E) 7.00 
A) 0.41 
B) 0.390 
C) 13.61 
D) 13.59 
E) 7.00

Question 13

Which one of the following is the weakest acid?

Accepted Answer

A) HF (Ka = 6.8 × 10-4) 
B) HClO (Ka = 3.0 × 10-8) 
C) HNO2 (Ka = 4.5 × 10-4) 
D) HCN (Ka = 4.9 × 10-10) 
E) Acetic acid (Ka = 1.8 × 10-5) 
A) HF (Ka = 6.8 × 10-4) 
B) HClO (Ka = 3.0 × 10-8) 
C) HNO2 (Ka = 4.5 × 10-4) 
D) HCN (Ka = 4.9 × 10-10) 
E) Acetic acid (Ka = 1.8 × 10-5)

Question 14

Using the data in the table,which of the conjugate bases below is the weakest base?

Accepted Answer

A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2- 
A) OAc- 
B) CHO2- 
C) ClO- 
D) F- 
E) OAc- and CHO2-

Question 15

Hydrochloric acid is a strong acid.This means that ________.

Accepted Answer

A) HCl dissociates completely to H+(aq)and Cl-(aq)when it dissolves in water 
B) HCl does not dissociate at all when it is dissolved in water 
C) HCl produces a gaseous product when it is neutralized 
D) HCl cannot be neutralized by a weak base 
E) aqueous solutions of HCl contain equal concentrations of H+(aq)and OH-(aq) 
A) HCl dissociates completely to H+(aq)and Cl-(aq)when it dissolves in water 
B) HCl does not dissociate at all when it is dissolved in water 
C) HCl produces a gaseous product when it is neutralized 
D) HCl cannot be neutralized by a weak base 
E) aqueous solutions of HCl contain equal concentrations of H+(aq)and OH-(aq)

Question 16

The conjugate base of NH3 is ________.

Accepted Answer

A) NH2- 
B) NH4+ 
C) NH2OH 
D) H3O+ 
E) OH- 
A) NH2- 
B) NH4+ 
C) NH2OH 
D) H3O+ 
E) OH-

Question 17

Which of the following 0.5 M aqueous salt solutions will have a pH of 7.0 at   LiF RbBr NaClO4 NH4Cl

Accepted Answer

A) LiF only 
B) NaClO4 only 
C) LiF and RbBr 
D) RbBr and NaClO4 
E) NH4Cl only 
A) LiF only 
B) NaClO4 only 
C) LiF and RbBr 
D) RbBr and NaClO4 
E) NH4Cl only

Question 18

The pH of an aqueous solution at 25.0 °C is 10.55.What is the molarity of   in this solution?

Accepted Answer

A) 2.8 × 10-11 
B) 3.5 × 10-4 
C) 3.45 
D) 1.1 × 10-13 
E) 3.5 × 1010 
A) 2.8 × 10-11 
B) 3.5 × 10-4 
C) 3.45 
D) 1.1 × 10-13 
E) 3.5 × 1010

Question 19

The   for acid HA is   What is the pH of a 0.15 M aqueous solution of KA?

Accepted Answer

A) 0.82 
B) 8.17 
C) 5.83 
D) 1.17 
E) 5.01 
A) 0.82 
B) 8.17 
C) 5.83 
D) 1.17 
E) 5.01

Question 20

The Ka for HCN is 4.9 × 10-10.What is the value of Kb for CN-?

Accepted Answer

A) 2.0 × 10-5 
B) 4.0 × 10-6 
C) 4.9 × 104 
D) 4.9 × 10-24 
E) 2.0 × 109 
A) 2.0 × 10-5 
B) 4.0 × 10-6 
C) 4.9 × 104 
D) 4.9 × 10-24 
E) 2.0 × 109

Exam 16: Acid-Base Equilibria

The of hypochlorous acid (HClO)is 3.0 × at 25.0 °C.Calculate the pH of a hypochlorous acid solution.

The hydride ion, ,is a stronger base than the hydroxide ion,O .The product(s)of the reaction of hydride ion with water is/are ________.

Ammonia is a ________.

Of the following,which is the weakest acid?

Using the data in the table,which of the conjugate bases below is the weakest base?

Ka for arsenic acic,HAsO42-,is 7.5 × 10-12.What is the pH of a 0.15 M aqueous solution of AsO43-?

The of citric acid is 1.9 × at 25.0 °C.What is the pH of a 0.35 M aqueous solution of citric acid?

Of the following,which is the strongest acid?

What is the pOH of a 0.030 M solution of calcium hydroxide?

The acid-dissociation constants of sulfurous acid (H2SO3)are Ka1 = 1.7 × 10-2 and at 25.0 °C.Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

An aqueous basic solution has a concentration of 0.050 M and Kb is 4.4 × 10-4.What is the concentration of hydronium ion in this solution (M)?

An aqueous solution contains 0.390 M HCl at 25.0 °C.The pH of the solution is ________.

Which one of the following is the weakest acid?

Using the data in the table,which of the conjugate bases below is the weakest base?

Hydrochloric acid is a strong acid.This means that ________.

The conjugate base of NH3 is ________.

Which of the following 0.5 M aqueous salt solutions will have a pH of 7.0 at LiF RbBr NaClO4 NH4Cl

The pH of an aqueous solution at 25.0 °C is 10.55.What is the molarity of in this solution?

The for acid HA is What is the pH of a 0.15 M aqueous solution of KA?

The Ka for HCN is 4.9 × 10-10.What is the value of Kb for CN-?

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

K_a for arsenic acic,HAsO₄^2-,is 7.5 × 10^-12.What is the pH of a 0.15 M aqueous solution of AsO₄^3-?

The acid-dissociation constants of sulfurous acid (H₂SO₃)are K_a1= 1.7 × 10^-2 and at 25.0 °C.Calculate the pH of a 0.163 M aqueous solution of sulfurous acid.

An aqueous basic solution has a concentration of 0.050 M and K_b is 4.4 × 10^-4.What is the concentration of hydronium ion in this solution (M)?

The conjugate base of NH₃ is ________.

Which of the following 0.5 M aqueous salt solutions will have a pH of 7.0 at LiF RbBr NaClO₄ NH₄Cl

The K_a for HCN is 4.9 × 10^-10.What is the value of K_b for CN^-?