Question 1

Which solution below has the highest concentration of hydronium ions?

Accepted Answer

A)  pH = 3.0
B)  pH = 10
C)  pH = 7.0
D)  pH = 6.4
E)  pH = 11.2

Question 2

What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.146?

Accepted Answer

A)  4.15
B)  9.85
C)  1.40 × 10-10
D)  7.15 × 10-5
E)  none of the above

Question 3

What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.0030 M?

Accepted Answer

A)  5.81
B)  -11.48
C)  2.52
D)  -2.52
E)  11.48

Question 4

Using the data in the table, which of the conjugate bases below is the strongest base? - B) C7H5O2- C) NO2- D) F- E) OAc- and C7H5O2-" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  OAc-
B)  C7H5O2-
C)  NO2-
D)  F-
E)  OAc- and C7H5O2-

Question 5

A Br∅nsted-Lowry acid is defined as a substance that ________.

Accepted Answer

A)  increases Ka when placed in H2O
B)  decreases [H+] when placed in H2O
C)  increases [OH-] when placed in H2O
D)  acts as a proton acceptor
E)  acts as a proton donor

Question 6

Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 × 10-4.

Accepted Answer

A)  1.78
B)  12.22
C)  5.36
D)  8.64
E)  12.42

Question 7

Classify the following compounds as weak bases (W) or strong bases (S) : methylamine carbonate ion potassium hydroxide

Accepted Answer

A)  W W S
B)  S S S
C)  S W W
D)  W S S
E)  W S W

Question 8

A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

Accepted Answer

Question 9

A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following acids will be the strongest?

Accepted Answer

A)  H2SO4
B)  HSO4-
C)  H2SO3
D)  H2SeO4
E)  HSO3-

Question 11

The molar concentration of hydroxide ion in pure water at 25 °C is ________.

Accepted Answer

A)  1.00
B)  0.00
C)  1.0 × 10-14
D)  1.0 × 10-7
E)  7.00

Question 12

The Ka of hypochlorous acid (HClO) is 3.00 × 10-8. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

Accepted Answer

A)  +2.45
B)  -2.45
C)  -9.22
D)  +9.22
E)  +4.61

Question 13

What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?

Accepted Answer

A)  8.40
B)  5.60
C)  9.00
D)  3.98
E)  7.00

Question 14

Which one of the following is a Br∅nsted-Lowry acid?

Accepted Answer

A)  (CH3) 3NH+
B)  CH3COOH
C)  HF
D)  HNO2
E)  all of the above

Question 15

Using the data in the table, which of the conjugate acids below is the weakest acid? 4+ B) C5H5NH+ C) H3NOH+ D) NH3CH3+ E) NH4+ and NH3CH3+" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  NH4+
B)  C5H5NH+
C)  H3NOH+
D)  NH3CH3+
E)  NH4+ and NH3CH3+

Question 16

In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?

Accepted Answer

A)  0.01 M H2SO3 (Ka = 1.4 × 10-2) 
B)  0.01 M HCN (Ka = 6.2 × 10-10) 
C)  0.01 M H2CO3 (Ka = 4.5 × 10-7) 
D)  0.01 M HC3H5O2 (Ka = 1.3 × 10-5) 
E)  0.01 M HOCl (Ka = 3.5 × 10-8)

Question 17

Which one of the following is a Br∅nsted-Lowry base?

Accepted Answer

A)  (CH3) 3N
B)  CH3COOH
C)  HF
D)  HNO2
E)  none of the above

Question 18

In acidic solution, ________.

Accepted Answer

A)  [H3O+] > [OH-]
B)  [H3O+] = [OH-]
C)  [H3O+] -]
D)  [OH-] > 7.00
E)  [H3O+] = 0M

Question 19

Ka for HF is 7.0 × 10-4. Kb for the fluoride ion is ________.

Accepted Answer

A)  2.0 × 10-8
B)  1.4 × 10-11
C)  7.0 × 10-18
D)  7.0 × 10-4
E)  1.4 × 103

Question 20

The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO2) ?

Accepted Answer

A)  11.64
B)  5.48
C)  3.39
D)  8.52
E)  4.26

Exam 16: Acid-Base Equilibria

In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization?

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A Lewis acid is an electron-pair acceptor, and a Lewis base is an electron-pair donor.

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Ka for HF is 7.0 × 10-4. Kb for the fluoride ion is ________.

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Which one of the following is a Br∅nsted-Lowry base?

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A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The Ka at 25.0 °C for formic acid is 1.8 × 10-4.

Correct AnswerverifiedShow Answer

What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.0030 M?

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Using the data in the table, which of the conjugate acids below is the weakest acid?

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What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.146?

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Which of the following acids will be the strongest?

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The molar concentration of hydroxide ion in pure water at 25 °C is ________.

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Using the data in the table, which of the conjugate bases below is the strongest base?

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A Br∅nsted-Lowry acid is defined as a substance that ________.

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In acidic solution, ________.

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Which one of the following is a Br∅nsted-Lowry acid?

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The Ka of hypochlorous acid (HClO) is 3.00 × 10-8. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

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What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?

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Classify the following compounds as weak bases (W) or strong bases (S) : methylamine carbonate ion potassium hydroxide

Correct AnswerverifiedShow Answer

Calculate the pH of 0.726 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 × 10-4.

Correct AnswerverifiedShow Answer

The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO2) ?

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Which solution below has the highest concentration of hydronium ions?

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K_a for HF is 7.0 × 10^-4. K_b for the fluoride ion is ________.

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A solution of formic acid is 3.0% dissociated at 25.0 °C. What is the original concentration (in M)of the formic acid solution? The K_a at 25.0 °C for formic acid is 1.8 × 10^-4.

Correct Answer
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What is the pH of an aqueous solution at 25.0 °C in which [OH^-] is 0.0030 M?

Correct Answer
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The K_a of hypochlorous acid (HClO) is 3.00 × 10^-⁸. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HClO?

Correct Answer
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What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10^-9 M hydroxide ion?

Correct Answer
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Calculate the pH of 0.726 M anilinium hydrochloride (C₆H₅NH₃Cl) solution in water, given that K_b for aniline is 3.83 × 10^-4.

Correct Answer
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The K_a for formic acid (HCO₂H) is 1.8 × 10^-4. What is the pH of a 0.20 M aqueous solution of sodium formate (NaHCO₂) ?

Correct Answer
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Correct Answer
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