Question 1

When 14.7 mL of aqueous HBr (a strong acid) was added to water, 0.482 L of a solution with a pH of 4.23 was produced. What was the molarity of the original HBr solution?

Accepted Answer

A) 1.9 × 10 −3 M 
B) 140 M 
C) 0.288 M 
D) 0.13 M 
E) None of these choices are correct. 
A) 1.9 × 10 −3 M 
B) 140 M 
C) 0.288 M 
D) 0.13 M 
E) None of these choices are correct.

Question 2

Which of the following is the strongest acid?

Accepted Answer

A) CH 3COOH 
B) HF 
C) H 3PO 4 
D) H 2SO 3 
E) HI 
A) CH 3COOH 
B) HF 
C) H 3PO 4 
D) H 2SO 3 
E) HI

Question 3

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77 × 10−4 M. What is the Ka for the acid?

Accepted Answer

A) 7.5 × 10 −3 M 
B) 2.8 × 10 −6 M 
C) 7.0 × 10 −7 M 
D) 7.0 × 10 −8 M 
E) 2.6 × 10 −11 M 
A) 7.5 × 10 −3 M 
B) 2.8 × 10 −6 M 
C) 7.0 × 10 −7 M 
D) 7.0 × 10 −8 M 
E) 2.6 × 10 −11 M

Question 4

What is the pOH of a 0.0085 M KOH solution?

Accepted Answer

A) 2.07 
B) 4.77 
C) 9.23 
D) 11.93 
E) None of these choices are correct. 
A) 2.07 
B) 4.77 
C) 9.23 
D) 11.93 
E) None of these choices are correct.

Question 5

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) The concentrations of fluoride ions and sodium ions will be identical. 
E) The concentration of fluoride ions will be greater than the concentration of sodium ions. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is acidic. 
D) The concentrations of fluoride ions and sodium ions will be identical. 
E) The concentration of fluoride ions will be greater than the concentration of sodium ions.

Question 6

Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10−4, K2 = 5.6 × 10−8, and K3 = 3 × 10−13. What is the concentration of the HAsO42− in a solution whose initial arsenic acid concentration was 0.35 M?

Accepted Answer

A) 9.4 × 10 −3  M 
B) 2.5 × 10 −4  M 
C) 8.8 × 10 −5  M 
D) 5.6 × 10 −8  M 
E) None of these choices are correct. 
A) 9.4 × 10 −3  M 
B) 2.5 × 10 −4  M 
C) 8.8 × 10 −5  M 
D) 5.6 × 10 −8  M 
E) None of these choices are correct.

Question 7

Which one of the following substances will give an aqueous solution of pH closest to 7?

Accepted Answer

A) KNO 3 
B) CO 2 
C) NH 4I 
D) NH 3 
E) CH 3NH 2 
A) KNO 3 
B) CO 2 
C) NH 4I 
D) NH 3 
E) CH 3NH 2

Question 8

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7.

Accepted Answer

A) True 
 B)False

Question 9

All Brønsted-Lowry bases contain the hydroxide ion, OH−.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is the strongest acid?

Accepted Answer

A) CH 3COOH 
B) HF 
C) H 3PO 4 
D) H 2SO 3 
E) H 2SO 4 
A) CH 3COOH 
B) HF 
C) H 3PO 4 
D) H 2SO 3 
E) H 2SO 4

Question 11

What is the pH of a 0.050 M LiOH solution?

Accepted Answer

A) < 1.0 
B) 1.30 
C) 3.00 
D) 11.00 
E) 12.70 
A) < 1.0 
B) 1.30 
C) 3.00 
D) 11.00 
E) 12.70

Question 12

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

Accepted Answer

A) 0.022 M 
B) 0.052 M 
C) 0.15 M 
D) 0.29 M 
E) None of these choices are correct. 
A) 0.022 M 
B) 0.052 M 
C) 0.15 M 
D) 0.29 M 
E) None of these choices are correct.

Question 13

What is the value of Ka for the methylammonium ion, CH3NH3+? Kb(CH3NH2) = 4.4 × 10−4

Accepted Answer

A) 4.4 × 10 −4 
B) 4.8 × 10 −6 
C) 4.4 × 10 −10 
D) 2.3 × 10 −11 
E) 4.4 × 10 −18 
A) 4.4 × 10 −4 
B) 4.8 × 10 −6 
C) 4.4 × 10 −10 
D) 2.3 × 10 −11 
E) 4.4 × 10 −18

Question 14

Which of the following aqueous liquids is the most acidic?

Accepted Answer

A) 0.1 M Al(NO 3)3, K a = 1 × 10 −5 
B) 0.1 M Be(NO 3)2, K a = 4 × 10 −6 
C) 0.1 M Pb(NO 3)2, K a = 3 × 10 −8 
D) 0.1 M Ni(NO 3)2, K a = 1 × 10 −10 
E) Pure water 
A) 0.1 M Al(NO 3)3, K a = 1 × 10 −5 
B) 0.1 M Be(NO 3)2, K a = 4 × 10 −6 
C) 0.1 M Pb(NO 3)2, K a = 3 × 10 −8 
D) 0.1 M Ni(NO 3)2, K a = 1 × 10 −10 
E) Pure water

Question 15

Which of the following aqueous liquids will have the highest pH?

Accepted Answer

A) 0.1 M CH 3COOH, p K a = 4.7 
B) 0.1 M CuCl 2, p K a = 7.5 
C) 0.1 M H 3C 6H 5O 7, p K a = 3.1 
D) 0.1 M ZnCl 2, p K a = 9.0 
E) Pure water 
A) 0.1 M CH 3COOH, p K a = 4.7 
B) 0.1 M CuCl 2, p K a = 7.5 
C) 0.1 M H 3C 6H 5O 7, p K a = 3.1 
D) 0.1 M ZnCl 2, p K a = 9.0 
E) Pure water

Question 16

Select the strongest acid from the following list.

Accepted Answer

A) HBrO 4 
B) HClO 
C) HBrO 2 
D) HBrO 
E) HIO 
A) HBrO 4 
B) HClO 
C) HBrO 2 
D) HBrO 
E) HIO

Question 17

Which of the following aqueous systems has the highest pH?

Accepted Answer

A) 0.1 M HA , p K a = 11.89 
B) 0.1 M HMO, p K a = 8.23 
C) 0.1 M HA , p K a = 4.55 
D) 0.1 M HBO, p K a = 2.43 
E) Pure water 
A) 0.1 M HA , p K a = 11.89 
B) 0.1 M HMO, p K a = 8.23 
C) 0.1 M HA , p K a = 4.55 
D) 0.1 M HBO, p K a = 2.43 
E) Pure water

Question 18

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO3, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

A) The solution is basic. 
B) The solution is neutral. 
C) The solution is weakly acidic. 
D) The solution is strongly acidic. 
E) The values for K a and K b for the species in solution must be known before a prediction can be made. 
A) The solution is basic. 
B) The solution is neutral. 
C) The solution is weakly acidic. 
D) The solution is strongly acidic. 
E) The values for K a and K b for the species in solution must be known before a prediction can be made.

Question 19

Hydrated metal ions in aqueous solution can act as Brønsted-Lowry acids.

Accepted Answer

A) True 
 B)False

Question 20

Calcium oxide, CaO, also known as quick lime, will react with carbon dioxide to form calcium carbonate, CaCO3. Which species, if any, acts as a Lewis acid in the reaction?

Accepted Answer

A) Ca 2+ 
B) O 2− 
C) CO 2 
D) CaCO 3 
E) None of these choices are correct. 
A) Ca 2+ 
B) O 2− 
C) CO 2 
D) CaCO 3 
E) None of these choices are correct.

Exam 18: Acid-Base Equilibria

When 14.7 mL of aqueous HBr (a strong acid) was added to water, 0.482 L of a solution with a pH of 4.23 was produced. What was the molarity of the original HBr solution?

Which of the following is the strongest acid?

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77 × 10−4 M. What is the Ka for the acid?

What is the pOH of a 0.0085 M KOH solution?

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10−4, K2 = 5.6 × 10−8, and K3 = 3 × 10−13. What is the concentration of the HAsO42− in a solution whose initial arsenic acid concentration was 0.35 M?

Which one of the following substances will give an aqueous solution of pH closest to 7?

If a strong acid such as HCl is diluted sufficiently with water, the pH will be higher than 7.

All Brønsted-Lowry bases contain the hydroxide ion, OH−.

Which of the following is the strongest acid?

What is the pH of a 0.050 M LiOH solution?

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

What is the value of Ka for the methylammonium ion, CH3NH3+? Kb(CH3NH2) = 4.4 × 10−4

Which of the following aqueous liquids is the most acidic?

Which of the following aqueous liquids will have the highest pH?

Select the strongest acid from the following list.

Which of the following aqueous systems has the highest pH?

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO3, to 1.00 L of water. Which statement about the solution is correct?

Hydrated metal ions in aqueous solution can act as Brønsted-Lowry acids.

Calcium oxide, CaO, also known as quick lime, will react with carbon dioxide to form calcium carbonate, CaCO3. Which species, if any, acts as a Lewis acid in the reaction?

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

A 0.050 M solution of the weak acid HA has [H₃O⁺] = 3.77 × 10⁻⁴ M. What is the K_afor the acid?

All Brønsted-Lowry bases contain the hydroxide ion, OH⁻.

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H₃O⁺] for a 0.20 M solution of picric acid?

What is the value of K_a for the methylammonium ion, CH₃NH₃⁺? K_b(CH₃NH₂) = 4.4 × 10⁻⁴

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO₃, to 1.00 L of water. Which statement about the solution is correct?

Calcium oxide, CaO, also known as quick lime, will react with carbon dioxide to form calcium carbonate, CaCO₃. Which species, if any, acts as a Lewis acid in the reaction?