Question 1

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, HC 2O 4, is a stronger base than the dihydrogen phosphate anion, H 2PO 4.
C)  Phosphoric acid is a weaker acid than oxalic acid.
D)  The dihydrogen phosphate anion, H 2PO 4 −, is a stronger acid than oxalic acid.
E)  Water is a stronger acid than either oxalic or phosphoric acids.F) C) and D)
G) A) and C)

Question 2

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 are correct.F) A) and C)
G) C) and D)

Question 3

Which of the following is considered a Lewis acid?

Accepted Answer

A)  CH 3NH 2
B)  BCl 3
C)  F −
D)  BF 4 −
E)  CH 4F) A) and E)
G) A) and B)

Question 4

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 are correct.F) A) and D)
G) A) and E)

Question 5

An aqueous solution is prepared by dissolving the salt formed by the neutralization of a weak acid by a weak base. Which statement about the solution is correct?

Accepted Answer

A)  The solution is strongly basic.
B)  The solution is weakly basic.
C)  The solution is neutral.
D)  The solution is acidic.
E)  The values for K a and K b for the species in solution must be known before a prediction can be made.F) A) and B)
G) None of the above

Question 6

What is the pH of a 0.0035 M KOH solution?

Accepted Answer

A)  2.46
B)  5.65
C)  8.35
D)  11.54
E)  None of these choices are correct.F) A) and B)
G) B) and D)

Question 7

What is the [OH−] for a solution at 25°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 MF) B) and E)
G) A) and D)

Question 8

What is the pH of a 0.050 M triethylamine, (C2H5) 3N, solution?Kb for triethylamine is 5.3 × 10−4.

Accepted Answer

A)  11.69
B)  8.68
C)  5.32
D)  2.31
E)  < 2.0F) A) and B)
G) A) and C)

Question 9

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.F) A) and D)
G) A) and C)

Question 10

Which of the following is a Lewis base?

Accepted Answer

A)  BCl 3
B)  Cu 2+
C)  Cl −
D)  Mn 2+
E)  NH 4 +F) D) and E)
G) B) and C)

Question 11

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Accepted Answer

A) True 
 B)False

Question 12

Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the following equilibrium is established. H3PO4(aq)  + NO2(aq) ⇄ H2PO4(aq)  + HNO2(aq) 
The equilibrium constant Kc for this reaction is greater than one. Based on this information, which of the following statements is correct?

Accepted Answer

A)  Phosphoric acid is a weaker acid than nitrous acid.
B)  Nitrous acid is a weaker acid than water.
C)  The nitrite anion is a weaker base than the dihydrogen phosphate anion.
D)  The dihydrogen phosphate anion is a stronger acid than nitrous acid.
E)  Phosphoric acid is a stronger acid than nitrous acid.F) A) and C)
G) D) and E)

Question 13

What is the pH of a 0.75 M HNO3 solution?

Accepted Answer

A)  0.12
B)  0.29
C)  0.63
D)  0.82
E)  > 1.0F) B) and C)
G) None of the above

Question 14

Which one of the following is a strong acid?

Accepted Answer

A)  H 2CO 3
B)  H 2SO 3
C)  H 2SO 4
D)  H 3PO 4
E)  CH 3COOHF) A) and B)
G) A) and C)

Question 15

What is the [OH−] for a solution at 25°C that has [H3O+] = 2.35 × 10−3 M?

Accepted Answer

A)  4.26 × 10 −5  M
B)  2.35 × 10 −11 M
C)  4.26 × 10 −12 M
D)  2.35 × 10 −17  M
E)  None of these choices are correct.F) A) and D)
G) All of the above

Question 16

Iodine trichloride, ICl3, will react with a chloride ion to form ICl4−. Which species, if any, acts as a Lewis acid this reaction?

Accepted Answer

A)  ICl 4 −
B)  ICl 3
C)  Cl −
D)  The solvent
E)  None of these choices are correct.F) C) and E)
G) C) and D)

Question 17

An aqueous solution is considered to be acidic if

Accepted Answer

A)  the hydroxide ion concentration is 10 −6 M.
B)  the hydrogen ion concentration is 10 −8 M.
C)  the hydroxide and hydrogen ion concentrations are equal.
D)  the hydroxide ion concentration is greater than the hydrogen ion concentration.
E)  the hydroxide ion concentration is 10 −10 M.F) B) and C)
G) None of the above

Question 18

In order to be a Brønsted-Lowry base, a species must contain a proton.

Accepted Answer

A) True 
 B)False

Question 19

What is the pOH of a 0.0250 M HI solution?

Accepted Answer

A)  0.944
B)  1.602
C)  12.398
D)  13.056
E)  None of these choices are correct.F) C) and E)
G) B) and E)

Question 20

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

Accepted Answer

A)  > 10 −5 M
B)  1.22 × 10 −6  M
C)  8.23 × 10 −12  M
D)  1.22 × 10 −13  M
E)  8.23 × 10 −16  MF) None of the above
G) B) and E)

Exam 18: Acid-Base Equilibria

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

Correct Answer
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An aqueous solution is considered to be acidic if

Correct Answer
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What is the pH of a 0.75 M HNO₃solution?

Correct Answer
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What is the [OH⁻] for a solution at 25°C that has pH = 4.29?

Correct Answer
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Correct Answer
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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?

Correct Answer
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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?

Correct Answer
verified

What is the pH of a 0.0125 M NaOH solution?

Correct Answer
verified

In order to be a Brønsted-Lowry base, a species must contain a proton.

Correct Answer
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Which one of the following is a strong acid?

Correct Answer
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An aqueous solution is prepared by dissolving the salt formed by the neutralization of a weak acid by a weak base. Which statement about the solution is correct?

Correct Answer
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What is the pH of a 0.050 M triethylamine, (C₂H₅) ₃N, solution?K_b for triethylamine is 5.3 × 10⁻⁴.

Correct Answer
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Iodine trichloride, ICl₃, will react with a chloride ion to form ICl₄⁻. Which species, if any, acts as a Lewis acid this reaction?

Correct Answer
verified

What is the pOH of a 0.0250 M HI solution?

Correct Answer
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Correct Answer
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Which of the following is a Lewis base?

Correct Answer
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What is the pH of a 0.0035 M KOH solution?

Correct Answer
verified

Which of the following is considered a Lewis acid?

Correct Answer
verified

What is the [OH⁻] for a solution at 25°C that has [H₃O⁺] = 2.35 × 10⁻³ M?

Correct Answer
verified

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Correct Answer
verified

Exam 18: Acid-Base Equilibria

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

Correct AnswerverifiedShow Answer

An aqueous solution is considered to be acidic if

Correct AnswerverifiedShow Answer

What is the pH of a 0.75 M HNO3 solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

What is the pH of a 0.0125 M NaOH solution?

Correct AnswerverifiedShow Answer

In order to be a Brønsted-Lowry base, a species must contain a proton.

Correct AnswerverifiedShow Answer

Which one of the following is a strong acid?

Correct AnswerverifiedShow Answer

An aqueous solution is prepared by dissolving the salt formed by the neutralization of a weak acid by a weak base. Which statement about the solution is correct?

Correct AnswerverifiedShow Answer

What is the pH of a 0.050 M triethylamine, (C2H5) 3N, solution?Kb for triethylamine is 5.3 × 10−4.

Correct AnswerverifiedShow Answer

Iodine trichloride, ICl3, will react with a chloride ion to form ICl4−. Which species, if any, acts as a Lewis acid this reaction?

Correct AnswerverifiedShow Answer

What is the pOH of a 0.0250 M HI solution?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is a Lewis base?

Correct AnswerverifiedShow Answer

What is the pH of a 0.0035 M KOH solution?

Correct AnswerverifiedShow Answer

Which of the following is considered a Lewis acid?

Correct AnswerverifiedShow Answer

What is the [OH−] for a solution at 25°C that has [H3O+] = 2.35 × 10−3 M?

Correct AnswerverifiedShow Answer

In applying molecular orbital theory, the bond order is calculated in the same way as with Lewis structures.

Correct AnswerverifiedShow Answer

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

Correct Answer
verified

Correct Answer
verified

What is the pH of a 0.75 M HNO₃solution?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

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?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

What is the pH of a 0.050 M triethylamine, (C₂H₅) ₃N, solution?K_b for triethylamine is 5.3 × 10⁻⁴.

Correct Answer
verified

Iodine trichloride, ICl₃, will react with a chloride ion to form ICl₄⁻. Which species, if any, acts as a Lewis acid this reaction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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What is the [OH⁻] for a solution at 25°C that has [H₃O⁺] = 2.35 × 10⁻³ M?

Correct Answer
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Correct Answer
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