Question 1

What is the conjugate acid of HS-?

Accepted Answer

A)  HS2 
B)  S2- 
C)  HS 
D)  H2S 
E)  SOH 
A)  HS2 
B)  S2- 
C)  HS 
D)  H2S 
E)  SOH

Question 2

When the cation of a salt is the conjugate acid of a weak base then a solution of this salt will be ________.

Accepted Answer

The answer of When the cation of a salt is...

Question 3

What is the conjugate base of HSO4- in the reaction below? CO32- + HSO4-   HCO3- + SO42-

Accepted Answer

A)  HSO4- 
B)  CO32- 
C)  OH- 
D)  H3O+ 
E)  SO42- 
A)  HSO4- 
B)  CO32- 
C)  OH- 
D)  H3O+ 
E)  SO42-

Question 4

Which statement is true regarding the reversible reaction below? H2CO3+ F- 
    HCO3+ HF.
Ka1(H2CO3) = 4.2 × 10-7; Ka(HF) = 7.1 × 10-4

Accepted Answer

A)  At equilibrium, [HF] > [H2CO3] because HF is a stronger acid than H2CO3. 
B)  At equilibrium, [HF] > [H2CO3] because H2CO3 is a stronger acid than HF. 
C)  At equilibrium, [HF] = [H2CO3]. 
D)  At equilibrium, [H2CO3] > [HF] because HF is a stronger acid than H2CO3. 
E)  At equilibrium, [H2CO3] > [HF] because H2CO3 is a stronger acid than HF. 
A)  At equilibrium, [HF] > [H2CO3] because HF is a stronger acid than H2CO3. 
B)  At equilibrium, [HF] > [H2CO3] because H2CO3 is a stronger acid than HF. 
C)  At equilibrium, [HF] = [H2CO3]. 
D)  At equilibrium, [H2CO3] > [HF] because HF is a stronger acid than H2CO3. 
E)  At equilibrium, [H2CO3] > [HF] because H2CO3 is a stronger acid than HF.

Question 5

Which is the weakest acid?

Accepted Answer

A)  SO42- 
B)  H2SO3 
C)  H2SO4 
D)  HSO4- 
E)  HSO3- 
A)  SO42- 
B)  H2SO3 
C)  H2SO4 
D)  HSO4- 
E)  HSO3-

Question 6

What is the concentration of OH- in a 0.083 M NaOH solution?

Accepted Answer

A)  0.083 M 
B)  1.21 × 10-13 M 
C)  8.30 × 10-16 M 
D)  7 M 
E)  8.30 × 1012 M 
A)  0.083 M 
B)  1.21 × 10-13 M 
C)  8.30 × 10-16 M 
D)  7 M 
E)  8.30 × 1012 M

Question 7

RCOOH is an organic compound which is in the ________ family.

Accepted Answer

The answer of RCOOH is an organic compound which is...

Question 8

The substance NH3 is considered to be

Accepted Answer

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

Question 9

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)  0.20 M 
E)  0.29 M 
A)  0.022 M 
B)  0.052 M 
C)  0.15 M 
D)  0.20 M 
E)  0.29 M

Question 10

What is the name of a proton acceptor in an acid-base reaction?

Accepted Answer

A)  Arrhenius acid 
B)  Arrhenius base 
C)  Brønsted acid 
D)  Brønsted base 
E)  Lewis base 
A)  Arrhenius acid 
B)  Arrhenius base 
C)  Brønsted acid 
D)  Brønsted base 
E)  Lewis base

Question 11

A solution of sodium acetate (CH3COONa) in water is weakly basic.

Accepted Answer

A) True 
 B)False

Question 12

A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate to enough water to make 1.0 L of solution. The following equilibrium is established with the concentrations of the products greater than the concentrations of the reactants. Which of the statements about the equilibrium system is correct? H2C2O4(aq) + H2PO4-(aq)   HC2O4-(aq) + H3PO4(aq)

Accepted Answer

A)  Oxalic acid is a weaker acid than phosphoric acid. 
B)  The hydrogen oxalate anion, HC2O4-, is a stronger base than the dihydrogen phosphate anion, H2PO4-. 
C)  Phosphoric acid is a weaker acid than oxalic acid. 
D)  The dihydrogen phosphate anion, H2PO4-, is a stronger acid than oxalic acid. 
E)  Water is a stronger acid than either oxalic or phosphoric acids. 
A)  Oxalic acid is a weaker acid than phosphoric acid. 
B)  The hydrogen oxalate anion, HC2O4-, is a stronger base than the dihydrogen phosphate anion, H2PO4-. 
C)  Phosphoric acid is a weaker acid than oxalic acid. 
D)  The dihydrogen phosphate anion, H2PO4-, is a stronger acid than oxalic acid. 
E)  Water is a stronger acid than either oxalic or phosphoric acids.

Question 13

Acid strength increases in the series HCN 4-. Which of these species is the strongest base?

Accepted Answer

A)  H2SO4 
B)  SO42- 
C)  F- 
D)  CN - 
E)  HSO4- 
A)  H2SO4 
B)  SO42- 
C)  F- 
D)  CN - 
E)  HSO4-

Question 14

In aqueous solutions at 25°C, the sum of the hydroxide ion and hydronium ion concentrations ([H3O+] + [OH -]) equals 1 × 10-14.

Accepted Answer

A) True 
 B)False

Question 15

Which is a Lewis acid?

Accepted Answer

A)  NH3 
B)  NH4+ 
C)  H2O 
D)  BF3 
E)  F- 
A)  NH3 
B)  NH4+ 
C)  H2O 
D)  BF3 
E)  F-

Question 16

Which one of these salts will form an acidic solution upon dissolving in water?

Accepted Answer

A)  LiBr 
B)  NaF 
C)  NH4Br 
D)  KOH 
E)  NaCN 
A)  LiBr 
B)  NaF 
C)  NH4Br 
D)  KOH 
E)  NaCN

Question 17

What is the value of Kb for the formate anion, HCOO- ? Ka (HCOOH) = 2.1 × 10-4

Accepted Answer

A)  -2.1 × 10-4 
B)  2.1 × 10-4 
C)  6.9 × 10-6 
D)  4.8 × 10-11 
E)  2.1 × 10-18 
A)  -2.1 × 10-4 
B)  2.1 × 10-4 
C)  6.9 × 10-6 
D)  4.8 × 10-11 
E)  2.1 × 10-18

Question 18

What is [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?

Accepted Answer

A)  8.23 × 10-2 M 
B)  1.22 × 10-6 M 
C)  8.23 × 10-12 M 
D)  1.22 × 10-13 M 
E)  8.23 × 10-16 M 
A)  8.23 × 10-2 M 
B)  1.22 × 10-6 M 
C)  8.23 × 10-12 M 
D)  1.22 × 10-13 M 
E)  8.23 × 10-16 M

Question 19

Since arsenic is a nonmetal, As2O3 is expected to be a/an ________ oxide.

Accepted Answer

A)  acidic 
B)  ionic 
C)  amphoteric 
D)  neutral 
E)  basic 
A)  acidic 
B)  ionic 
C)  amphoteric 
D)  neutral 
E)  basic

Question 20

NH3 is a typical Lewis base.

Accepted Answer

A) True 
 B)False

Exam 16: Acids and Bases

What is the conjugate acid of HS-?

When the cation of a salt is the conjugate acid of a weak base then a solution of this salt will be ________.

What is the conjugate base of HSO4- in the reaction below? CO32- + HSO4- HCO3- + SO42-

Which statement is true regarding the reversible reaction below? H2CO3+ F- HCO3+ HF. Ka1(H2CO3) = 4.2 × 10-7; Ka(HF) = 7.1 × 10-4

Which is the weakest acid?

What is the concentration of OH- in a 0.083 M NaOH solution?

RCOOH is an organic compound which is in the ________ family.

The substance NH3 is considered to be

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 name of a proton acceptor in an acid-base reaction?

A solution of sodium acetate (CH3COONa) in water is weakly basic.

Acid strength increases in the series HCN < HF < HSO4-. Which of these species is the strongest base?

In aqueous solutions at 25°C, the sum of the hydroxide ion and hydronium ion concentrations ([H3O+] + [OH -]) equals 1 × 10-14.

Which is a Lewis acid?

Which one of these salts will form an acidic solution upon dissolving in water?

What is the value of Kb for the formate anion, HCOO- ? Ka (HCOOH) = 2.1 × 10-4

What is [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?

Since arsenic is a nonmetal, As2O3 is expected to be a/an ________ oxide.

NH3 is a typical Lewis base.

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

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What is the conjugate base of HSO₄^- in the reaction below? CO₃^2- + HSO₄^- HCO₃^- + SO₄^2-

Which statement is true regarding the reversible reaction below? H₂CO₃+ F^- HCO₃+ HF. K_a1(H₂CO₃) = 4.2 × 10^-7; K_a(HF) = 7.1 × 10^-4

What is the concentration of OH^- in a 0.083 M NaOH solution?

The substance NH₃ is considered to be

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?

A solution of sodium acetate (CH₃COONa) in water is weakly basic.

Acid strength increases in the series HCN < HF < HSO₄^-. Which of these species is the strongest base?

In aqueous solutions at 25°C, the sum of the hydroxide ion and hydronium ion concentrations ([H₃O⁺] + [OH^-]) equals 1 × 10^-14.

What is the value of K_b for the formate anion, HCOO^- ? K_a (HCOOH) = 2.1 × 10^-4

What is [OH^-] for a solution at 25°C that has [H₃O⁺] = 8.23 × 10^-2^M?

Since arsenic is a nonmetal, As₂O₃ is expected to be a/an ________ oxide.

NH₃ is a typical Lewis base.