Question 1

Define an acid according to the Arrhenius theory, and write a balanced equation to support this definition.

Accepted Answer

An acid is a substance which c

Question 2

The substance HCl is considered

Accepted Answer

A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound. 
A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound.

Question 3

The substance Ba(OH)2 is considered

Accepted Answer

A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound. 
A)  a weak Arrhenius acid. 
B)  a weak Arrhenius base. 
C)  a strong Arrhenius acid. 
D)  a strong Arrhenius base. 
E)  a neutral compound.

Question 4

All Brønsted-Lowry bases have at least one lone pair of electrons.

Accepted Answer

A) True 
 B)False

Question 5

Select the pair of substances in which an acid is listed followed by its conjugate base.

Accepted Answer

A)  H+, HCl 
B)  NH3, NH4+ 
C)  HPO42¯, H2PO4¯ 
D)  HCO3¯, CO32¯ 
E)  CH3COOH, CH3COOH2+ 
A)  H+, HCl 
B)  NH3, NH4+ 
C)  HPO42¯, H2PO4¯ 
D)  HCO3¯, CO32¯ 
E)  CH3COOH, CH3COOH2+

Question 6

What is the [OH¯] for a solution at 25 $\degree$C that has pH = 4.29?

Accepted Answer

A)  1.4 *10¯2 M 
B)  5.l * 10¯5 M 
C)  1.9 * 10¯10 M 
D)  7.3 * 10¯13 M 
E)  9.71 M 
A)  1.4 *10¯2 M 
B)  5.l * 10¯5 M 
C)  1.9 * 10¯10 M 
D)  7.3 * 10¯13 M 
E)  9.71 M

Question 7

Select the strongest acid from the following list.

Accepted Answer

A)  HBrO4 
B)  HClO 
C)  HBrO2 
D)  HBrO 
E)  HIO 
A)  HBrO4 
B)  HClO 
C)  HBrO2 
D)  HBrO 
E)  HIO

Question 8

Farmers who raise cotton once used arsenic acid, H3AsO4, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

Accepted Answer

A)  0.85 
B)  1.96 
C)  3.90 
D)  4.51 
E)  None of these choices is correct. 
A)  0.85 
B)  1.96 
C)  3.90 
D)  4.51 
E)  None of these choices is correct.

Question 9

A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this acid?

Accepted Answer

A)  7.2 * 101 
B)  0.16 
C)  0.099 
D)  0.0014 
E)  0.00027 
A)  7.2 * 101 
B)  0.16 
C)  0.099 
D)  0.0014 
E)  0.00027

Question 10

Describe what is meant by the "leveling effect." Use a real acid as an example, and write an appropriate equation.

Accepted Answer

In aqueous solution, the strongest acid

Question 11

Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

Accepted Answer

A) True 
 B)False

Question 12

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Accepted Answer

A)  Fe3+ 
B)  H3O+ 
C)  HSO4¯ 
D)  NH3 
E)  H2O 
A)  Fe3+ 
B)  H3O+ 
C)  HSO4¯ 
D)  NH3 
E)  H2O

Question 13

Kw = 1.0 *10¯14, regardless of temperature.

Accepted Answer

A) True 
 B)False

Question 14

A solution is prepared by adding 0.10 mol of potassium acetate, KCH3COO, 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 potassium ions and acetate ions will be identical. 
E)  The concentration of acetate ions will be greater than the concentration of potassium ions. 
A)  The solution is basic. 
B)  The solution is neutral. 
C)  The solution is acidic. 
D)  The concentrations of potassium ions and acetate ions will be identical. 
E)  The concentration of acetate ions will be greater than the concentration of potassium ions.

Question 15

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A)  HBr, HI 
B)  HClO2, HClO3 
C)  H2SeO4, H2SeO3 
D)  HNO2, HNO3 
E)  HF, HCl 
A)  HBr, HI 
B)  HClO2, HClO3 
C)  H2SeO4, H2SeO3 
D)  HNO2, HNO3 
E)  HF, HCl

Question 16

Butyric acid is responsible for the odor in rancid butter. A solution of 0.25 M butyric acid has a pH of 2.71. What is the Ka for the acid?

Accepted Answer

A)  0.36 
B)  2.4 *10¯2 
C)  7.8 * 10¯3 
D)  1.5 * 10¯5 
E)  None of these choices is correct. 
A)  0.36 
B)  2.4 *10¯2 
C)  7.8 * 10¯3 
D)  1.5 * 10¯5 
E)  None of these choices is correct.

Question 17

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A)  H2AsO3, H2AsO4 
B)  HI, HBr 
C)  HClO, HClO3 
D)  H2S, HCl 
E)  H2SO3, H2SO4 
A)  H2AsO3, H2AsO4 
B)  HI, HBr 
C)  HClO, HClO3 
D)  H2S, HCl 
E)  H2SO3, H2SO4

Question 18

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)  Ca2+ 
B)  O2¯ 
C)  CO2 
D)  CaCO3 
E)  None of the species acts as a Lewis acid in this reaction. 
A)  Ca2+ 
B)  O2¯ 
C)  CO2 
D)  CaCO3 
E)  None of the species acts as a Lewis acid in this reaction.

Question 19

Which of the following is considered a Lewis acid?

Accepted Answer

A)  CH3NH2 
B)  BCl3 
C)  F¯ 
D)  BF4¯ 
E)  CH4 
A)  CH3NH2 
B)  BCl3 
C)  F¯ 
D)  BF4¯ 
E)  CH4

Question 20

What is the pH of a 0.0125 M NaOH solution?

Accepted Answer

A)  0.972 
B)  1.903 
C)  12.097 
D)  13.028 
E)  None of these choices is correct. 
A)  0.972 
B)  1.903 
C)  12.097 
D)  13.028 
E)  None of these choices is correct.

Exam 18: Acid-Base Equilibria

Define an acid according to the Arrhenius theory, and write a balanced equation to support this definition.

The substance HCl is considered

The substance Ba(OH)2 is considered

All Brønsted-Lowry bases have at least one lone pair of electrons.

Select the pair of substances in which an acid is listed followed by its conjugate base.

What is the [OH¯] for a solution at 25 °\degree° C that has pH = 4.29?

Select the strongest acid from the following list.

Farmers who raise cotton once used arsenic acid, H3AsO4, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this acid?

Describe what is meant by the "leveling effect." Use a real acid as an example, and write an appropriate equation.

Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Kw = 1.0 *10¯14, regardless of temperature.

A solution is prepared by adding 0.10 mol of potassium acetate, KCH3COO, to 1.00 L of water. Which statement about the solution is correct?

Which of the following pairs has the stronger acid listed first?

Butyric acid is responsible for the odor in rancid butter. A solution of 0.25 M butyric acid has a pH of 2.71. What is the Ka for the acid?

Which of the following pairs has the stronger acid listed first?

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?

Which of the following is considered a Lewis acid?

What is the pH of a 0.0125 M NaOH solution?

Keys to the Study of Chemistry

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The substance Ba(OH)₂ is considered

What is the [OH¯] for a solution at 25 $\degree$ C that has pH = 4.29?

Farmers who raise cotton once used arsenic acid, H₃AsO₄, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of K_a for this acid?

K_w = 1.0 *10¯¹⁴, regardless of temperature.

A solution is prepared by adding 0.10 mol of potassium acetate, KCH₃COO, to 1.00 L of water. Which statement about the solution is correct?

Butyric acid is responsible for the odor in rancid butter. A solution of 0.25 M butyric acid has a pH of 2.71. What is the K_a for the acid?

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?