Question 1

Which below best describe(s) the behavior of an amphoteric hydroxide in water?

Accepted Answer

A)  With conc. aq. NaOH, its suspension dissolves.
B)  With conc. aq. HCl, its suspension dissolves.
C)  With conc. aq. NaOH, its clear solution forms a precipitate.
D)  With conc. aq. HCl, its clear solution forms a precipitate.
E)  With both conc. aq. NaOH and conc. aq. HCl, its suspension dissolves.F) None of the above
G) C) and D)

Question 2

Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant of nitrous acid is 4.50 × 10-4.

Accepted Answer

A)  1.12 × 10-4
B)  0.0450
C)  4.25
D)  0.342
E)  5.53F) A) and D)
G) B) and C)

Question 3

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of hydrogen fluoride after addition of 8.00 mL of 0.0100 M HCl to 25.0 mL of this solution is __________ M.

Accepted Answer

A)  0.0979
B)  0.0930
C)  0.129
D)  0.123
E)  0.00976F) C) and E)
G) All of the above

Question 4

In which of the following aqueous solutions would you expect AgCl to have the lowest solubility?

Accepted Answer

A)  pure water
B)  0.020 M BaCl2
C)  0.015 NaCl
D)  0.020 AgNO3
E)  0.020 KClF) None of the above
G) All of the above

Question 5

For any buffer system, the buffer capacity depends on the amount of acid and base from which the buffer is made.

Accepted Answer

A) True 
 B)False

Question 6

The addition of hydrochloric acid and __________ to water produces a buffer solution.

Accepted Answer

A)  HC6H5O
B)  NaOH
C)  NH3
D)  HNO3
E)  NaNO3F) B) and C)
G) A) and B)

Question 7

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of fluoride ions after the addition of 4.00 mL of 0.0100 M HCl to 25.0 mL of this solution is __________ M.

Accepted Answer

A)  0.0862
B)  0.0876
C)  0.0980
D)  0.0848
E)  0.00253F) A) and E)
G) B) and D)

Question 8

Calculate the pH of a solution prepared by dissolving 0.270 mol of formic acid (HCO2H) and 0.230 mol of sodium formate (NaCO2H) in water sufficient to yield 1.00 L of solution. The Ka of formic acid is 1.77 × 10-4.

Accepted Answer

A)  2.099
B)  10.318
C)  3.682
D)  2.307
E)  3.952F) B) and E)
G) A) and B)

Question 9

Which of the following could be added to a solution of acetic acid to prepare a buffer?

Accepted Answer

A)  sodium hydroxide
B)  hydrochloric acid
C)  nitric acid
D)  more acetic acid
E)  None of the above can be added to an acetic acid solution to prepare a buffer.F) A) and B)
G) A) and C)

Question 10

Which compound listed below has the greatest molar solubility in water?

Accepted Answer

A)  CdCO3
B)  Cd(OH) 2
C)  AgI
D)  CaF2
E)  ZnCO3F) None of the above
G) A) and E)

Question 11

Calculate the pH of a buffer solution that contains 0.820 grams of sodium acetate and 0.010 moles of acetic acid in 100 ml of water. The Ka of acetic acid is 1.77 × 10-5.

Accepted Answer

Question 12

What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.

Accepted Answer

A)  14.28
B)  10.43
C)  5.48
D)  3.57
E)  4.13F) B) and E)
G) None of the above

Question 13

In which of the following aqueous solutions would you expect AgBr to have the lowest solubility?

Accepted Answer

A)  pure water
B)  0.20 M NaBr
C)  0.10 M AgNO3
D)  0.15 M KBr
E)  0.10 M LiBrF) None of the above
G) D) and E)

Question 14

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________.

Accepted Answer

A)  6.29
B)  7.00
C)  8.11
D)  5.78
E)  0.00F) B) and E)
G) C) and D)

Question 15

Which one of the following is not amphoteric?

Accepted Answer

A)  Al(OH) 3
B)  Ca(OH) 2
C)  Cr(OH) 3
D)  Zn(OH) 2
E)  Sn(OH) 2F) C) and D)
G) B) and D)

Question 16

Which compound listed below has the smallest molar solubility in water?

Accepted Answer

A)  ZnCO3
B)  Cd(OH) 2
C)  CdCO3
D)  AgI
E)  CaF2F) C) and D)
G) B) and C)

Question 17

The addition of hydrofluoric acid and __________ to water produces a buffer solution.

Accepted Answer

A)  HCl
B)  NaNO3
C)  NaF
D)  NaCl
E)  NaBrF) A) and D)
G) C) and D)

Question 18

The pH of a solution prepared by dissolving 0.350 mol of solid methylamine hydrochloride (CH3NH3Cl) in 1.00 L of 1.10 M methylamine (CH3NH2) is __________. The Kb for methylamine is 4.40 × 10-4. (Assume the final volume is 1.00 L.)

Accepted Answer

A)  1.66
B)  2.86
C)  10.28
D)  11.14
E)  10.61F) A) and E)
G) C) and D)

Question 19

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 30.0 mL of 0.145 M HC2H3O2 is __________.

Accepted Answer

A)  9.97
B)  7.74
C)  1.172
D)  12.828
E)  none of the aboveF) A) and B)
G) A) and E)

Question 20

Calculate the pH of a solution prepared by dissolving 0.150 mol of benzoic acid and 0.300 mol of sodium benzoate in water sufficient to yield 1.00 L of solution. The Ka of benzoic acid is 6.30 × 10-5.

Accepted Answer

A)  2.516
B)  3.892
C)  4.502
D)  10.158
E)  4.195F) A) and D)
G) None of the above

Exam 17: Additional Aspects of Aqueous Equilibria

Calculate the pH of a buffer solution that contains 0.820 grams of sodium acetate and 0.010 moles of acetic acid in 100 ml of water. The Ka of acetic acid is 1.77 × 10-5.

Correct AnswerverifiedShow Answer

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 30.0 mL of 0.145 M HC2H3O2 is __________.

Correct AnswerverifiedShow Answer

The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is __________.

Correct AnswerverifiedShow Answer

Which compound listed below has the greatest molar solubility in water?

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Which compound listed below has the smallest molar solubility in water?

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Which below best describe(s) the behavior of an amphoteric hydroxide in water?

Correct AnswerverifiedShow Answer

The addition of hydrofluoric acid and __________ to water produces a buffer solution.

Correct AnswerverifiedShow Answer

Calculate the pH of a solution prepared by dissolving 0.150 mol of benzoic acid and 0.300 mol of sodium benzoate in water sufficient to yield 1.00 L of solution. The Ka of benzoic acid is 6.30 × 10-5.

Correct AnswerverifiedShow Answer

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of fluoride ions after the addition of 4.00 mL of 0.0100 M HCl to 25.0 mL of this solution is __________ M.

Correct AnswerverifiedShow Answer

Which of the following could be added to a solution of acetic acid to prepare a buffer?

Correct AnswerverifiedShow Answer

For any buffer system, the buffer capacity depends on the amount of acid and base from which the buffer is made.

Correct AnswerverifiedShow Answer

In which of the following aqueous solutions would you expect AgCl to have the lowest solubility?

Correct AnswerverifiedShow Answer

The pH of a solution prepared by dissolving 0.350 mol of solid methylamine hydrochloride (CH3NH3Cl) in 1.00 L of 1.10 M methylamine (CH3NH2) is __________. The Kb for methylamine is 4.40 × 10-4. (Assume the final volume is 1.00 L.)

Correct AnswerverifiedShow Answer

Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant of nitrous acid is 4.50 × 10-4.

Correct AnswerverifiedShow Answer

The addition of hydrochloric acid and __________ to water produces a buffer solution.

Correct AnswerverifiedShow Answer

In which of the following aqueous solutions would you expect AgBr to have the lowest solubility?

Correct AnswerverifiedShow Answer

Consider a solution containing 0.100 M fluoride ions and 0.126 M hydrogen fluoride. The concentration of hydrogen fluoride after addition of 8.00 mL of 0.0100 M HCl to 25.0 mL of this solution is __________ M.

Correct AnswerverifiedShow Answer

What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The Ka of lactic acid is 1.4 × 10-4.

Correct AnswerverifiedShow Answer

Calculate the pH of a solution prepared by dissolving 0.270 mol of formic acid (HCO2H) and 0.230 mol of sodium formate (NaCO2H) in water sufficient to yield 1.00 L of solution. The Ka of formic acid is 1.77 × 10-4.

Correct AnswerverifiedShow Answer

Which one of the following is not amphoteric?

Correct AnswerverifiedShow Answer

Calculate the pH of a buffer solution that contains 0.820 grams of sodium acetate and 0.010 moles of acetic acid in 100 ml of water. The K_a of acetic acid is 1.77 × 10^-5.

Correct Answer
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The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 30.0 mL of 0.145 M HC₂H₃O₂ is __________.

Correct Answer
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Calculate the pH of a solution prepared by dissolving 0.150 mol of benzoic acid and 0.300 mol of sodium benzoate in water sufficient to yield 1.00 L of solution. The K_a of benzoic acid is 6.30 × 10^-5.

Correct Answer
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Correct Answer
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The pH of a solution prepared by dissolving 0.350 mol of solid methylamine hydrochloride (CH₃NH₃Cl) in 1.00 L of 1.10 M methylamine (CH₃NH₂) is __________. The K_b for methylamine is 4.40 × 10^-4. (Assume the final volume is 1.00 L.)

Correct Answer
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Calculate the percent ionization of nitrous acid in a solution that is 0.249 M in nitrous acid. The acid dissociation constant of nitrous acid is 4.50 × 10^-4.

Correct Answer
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What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The K_a of lactic acid is 1.4 × 10^-4.

Correct Answer
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Calculate the pH of a solution prepared by dissolving 0.270 mol of formic acid (HCO₂H) and 0.230 mol of sodium formate (NaCO₂H) in water sufficient to yield 1.00 L of solution. The K_a of formic acid is 1.77 × 10^-4.

Correct Answer
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Correct Answer
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