Question 1

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hydrazoic acid is 1.9 × 10-5.

Accepted Answer

A)  2.54
B)  11.47
C)  7.00
D)  4.70
E)  4.74

Question 2

The Ka of acetic acid is 1.76 × 10-5. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

Accepted Answer

A)  1.705
B)  0.851
C)  3.406
D)  4.232
E)  2.383

Question 3

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Accepted Answer

A)  The concentration of hydronium ions will increase significantly.
B)  The concentration of fluoride ions will increase as will the concentration of hydronium ions.
C)  The concentration of hydrogen fluoride will decrease and the concentration of fluoride ions will increase.
D)  The concentration of fluoride ion will decrease and the concentration of hydrogen fluoride will increase.
E)  The fluoride ions will precipitate out of solution as its acid salt.

Question 4

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

Accepted Answer

A)  HCl
B)  NaNO3
C)  NaCl
D)  NaOH
E)  NaBr

Question 5

The concentration of iodide ions in a saturated solution of lead (II) iodide is ________ M. The solubility product constant of PbI2 is 1.4 × 10-8.

Accepted Answer

A)  3.8 × 10-4
B)  3.0 × 10-3
C)  1.5 × 10-3
D)  3.5 × 10-9
E)  1.4 × 10-8

Question 6

In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

Accepted Answer

A)  the system is not at equilibrium
B)  the buffering capacity is significantly decreased
C)  the -log of the [H+] and the -log of the Ka are equal
D)  All of the above are true.

Question 7

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

Accepted Answer

A)  0.030 M LiF
B)  pure water
C)  0.023 M NaF
D)  0.015 M KF
E)  0.0075 M AgNO3

Question 8

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC2H3O2 is ________.

Accepted Answer

A)  9.97
B)  7.74
C)  0.878
D)  13.122
E)  none of the above

Question 9

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH) 2 and 150.0 mL of 0.125 M HCl is ________.

Accepted Answer

A)  6.29
B)  4.11
C)  1.14
D)  5.78
E)  1.34

Question 10

The solubility of slightly soluble salts containing basic anions is proportional to the pH of the solution.

Accepted Answer

A) True 
 B)False

Question 11

Which one of the following pairs cannot be mixed together to form a buffer solution?

Accepted Answer

A)  C5H5N, C5H5NHCl
B)  HC2H3O2, NaOH (C2H3O2- = acetate) 
C)  KOH, HI
D)  NH2CH3, HCl
E)  NaClO, HNO3

Question 12

A solution containing which one of the following pairs of substances will be a buffer solution?

Accepted Answer

A)  NaI, HI
B)  KBr, HBr
C)  RbCl, HCl
D)  CsF, HF
E)  none of the above

Question 13

The molar solubility of ________ is not affected by the pH of the solution.

Accepted Answer

A)  Na3PO4
B)  NaF
C)  KNO3
D)  AlCl3
E)  MnS

Question 14

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

Accepted Answer

A)  1.314
B)  1.403
C)  0.00824
D)  12.597
E)  12.923

Question 15

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 16

Of the substances below, ________ will decrease the solubility of Pb(CN) 2 in a saturated solution.

Accepted Answer

A)  Pb(MnO4) 2
B)  NaMnO4
C)  HMnO4
D)  H2O2
E)  NaCl

Exam 17: Additional Aspects of Aqueous Equilibria

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

Correct Answer
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In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

Correct Answer
verified

The solubility of slightly soluble salts containing basic anions is proportional to the pH of the solution.

Correct Answer
verified

The molar solubility of ________ is not affected by the pH of the solution.

Correct Answer
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The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH) ₂ and 150.0 mL of 0.125 M HCl is ________.

Correct Answer
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The K_a of acetic acid is 1.76 × 10^-⁵. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

Correct Answer
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Of the substances below, ________ will decrease the solubility of Pb(CN) ₂ in a saturated solution.

Correct Answer
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The addition of hydrofluoric acid and ________ to water produces a buffer solution.

Correct Answer
verified

Which one of the following pairs cannot be mixed together to form a buffer solution?

Correct Answer
verified

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

Correct Answer
verified

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Correct Answer
verified

A solution containing which one of the following pairs of substances will be a buffer solution?

Correct Answer
verified

The concentration of iodide ions in a saturated solution of lead (II) iodide is ________ M. The solubility product constant of PbI₂ is 1.4 × 10^-8.

Correct Answer
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In which of the following aqueous solutions would you expect AgF to have the lowest solubility?

Correct Answer
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The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC₂H₃O₂ is ________.

Correct Answer
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A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The K_a of hydrazoic acid is 1.9 × 10^-5.

Correct Answer
verified

Exam 17: Additional Aspects of Aqueous Equilibria

The pH of a solution prepared by mixing 45.0 mL of 0.183 M KOH and 35.0 mL of 0.145 M HCl is ________.

Correct AnswerverifiedShow Answer

In a solution, when the concentrations of a weak acid and its conjugate base are equal, ________.

Correct AnswerverifiedShow Answer

The solubility of slightly soluble salts containing basic anions is proportional to the pH of the solution.

Correct AnswerverifiedShow Answer

The molar solubility of ________ is not affected by the pH of the solution.

Correct AnswerverifiedShow Answer

The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH) 2 and 150.0 mL of 0.125 M HCl is ________.

Correct AnswerverifiedShow Answer

The Ka of acetic acid is 1.76 × 10-5. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

Correct AnswerverifiedShow Answer

Of the substances below, ________ will decrease the solubility of Pb(CN) 2 in a saturated solution.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following pairs cannot be mixed together to form a buffer solution?

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

What change will be caused by addition of a small amount of HCl to a solution containing fluoride ions and hydrogen fluoride?

Correct AnswerverifiedShow Answer

A solution containing which one of the following pairs of substances will be a buffer solution?

Correct AnswerverifiedShow Answer

The concentration of iodide ions in a saturated solution of lead (II) iodide is ________ M. The solubility product constant of PbI2 is 1.4 × 10-8.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC2H3O2 is ________.

Correct AnswerverifiedShow Answer

A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The Ka of hydrazoic acid is 1.9 × 10-5.

Correct AnswerverifiedShow Answer

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The pH of a solution prepared by mixing 40.0 mL of 0.125 M Mg(OH) ₂ and 150.0 mL of 0.125 M HCl is ________.

Correct Answer
verified

The K_a of acetic acid is 1.76 × 10^-⁵. The pH of a buffer prepared by combining 15.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid is ________.

Correct Answer
verified

Of the substances below, ________ will decrease the solubility of Pb(CN) ₂ in a saturated solution.

Correct Answer
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The concentration of iodide ions in a saturated solution of lead (II) iodide is ________ M. The solubility product constant of PbI₂ is 1.4 × 10^-8.

Correct Answer
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Correct Answer
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The pH of a solution prepared by mixing 55.0 mL of 0.183 M KOH and 10.0 mL of 0.145 M HC₂H₃O₂ is ________.

Correct Answer
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A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH after 26.0 mL of base is added? The K_a of hydrazoic acid is 1.9 × 10^-5.

Correct Answer
verified