Question 1

The molar concentration of hydronium ion in pure water at 25°C is __________.

Accepted Answer

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

Question 2

Ammonia is a __________.

Accepted Answer

A)  weak acid
B)  strong base
C)  weak base
D)  strong acid
E)  saltF) C) and D)
G) A) and B)

Question 3

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

Accepted Answer

A)  1.94
B)  4.29
C)  7.00
D)  14.0
E)  9.71F) All of the above
G) A) and B)

Question 4

Which one of the following statements regarding Kw is false?

Accepted Answer

A)  pKw is 14.00 at 25°C
B)  The value of Kw is always 1.0 × 10-14.
C)  Kw changes with temperature.
D)  The value of Kw shows that water is a weak acid.
E)  Kw is known as the ion product of water.F) All of the above
G) A) and B)

Question 5

Calculate the concentration (in M) of hydroxide ions in a solution at 25.0°C with a pOH of 4.223.

Accepted Answer

A)  5.98 × 10-5
B)  1.67 × 10-10
C)  1.67 × 104
D)  5.99 × 10-19
E)  1.00 × 10-7F) D) and E)
G) A) and B)

Question 6

What is the pOH 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)  7.00F) B) and D)
G) C) and E)

Question 7

What is the pOH of an aqueous solution at 25.0°C in which [H+] is 0.0025 M?

Accepted Answer

A)  8.01
B)  11.40
C)  -11.40
D)  -8.01
E)  none of the aboveF) A) and D)
G) D) and E)

Question 8

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

Accepted Answer

A)  8.400
B)  5.600
C)  9.000
D)  3.980
E)  7.000F) A) and B)
G) None of the above

Question 9

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-F) A) and D)
G) B) and D)

Question 10

The base-dissociation constant, Kb, for pyridine, C5H5N, is 1.4 × 10-9. The acid-dissociation constant, Ka, for the pyridinium ion, C5H5NH+, is __________.

Accepted Answer

A)  1.0 × 10-7
B)  1.4 × 10-23
C)  7.1 × 10-4
D)  1.4 × 10-5
E)  7.1 × 10-6F) A) and B)
G) A) and C)

Question 11

The Ka of hydrazoic acid (HN3) is 1.9 × 10-5 at 25.0°C. What is the pH of a 0.40 M aqueous solution of HN3?

Accepted Answer

A)  0.40
B)  2.16
C)  5.23
D)  2.56
E)  -3.46F) A) and B)
G) None of the above

Question 12

Of the following substances, an aqueous solution of __________ will form basic solutions. NH4Cl Cu(NO3) 2 K2CO3 NaF

Accepted Answer

A)  NH4Cl, Cu(NO3) 2
B)  K2CO3, NH4Cl
C)  NaF only
D)  NaF, K2CO3
E)  NH4Cl onlyF) B) and E)
G) A) and B)

Question 13

What is the pOH of an aqueous solution at 25.0 °C in which [OH-] is 0.0040 M?

Accepted Answer

A)  11.60
B)  -2.40
C)  2.40
D)  -11.60
E)  5.52F) A) and E)
G) C) and E)

Question 14

Calculate the pOH of 0.716 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)  5.37
D)  8.63
E)  12.42F) None of the above
G) A) and E)

Question 15

Kb for NH3 is 1.8 × 10-5. What is the pH of a 0.45 M aqueous solution of NH4Cl at 25.0 °C?

Accepted Answer

A)  2.55
B)  11.45
C)  9.20
D)  4.80
E)  11.23F) C) and D)
G) A) and B)

Question 16

Which solution below has the highest concentration of hydroxide ions?

Accepted Answer

A)  pH = 3.21
B)  pH = 12.6
C)  pH = 7.93
D)  pH = 9.82
E)  pH = 7.00F) A) and B)
G) B) and D)

Question 17

The conjugate acid of CH3NH2 is __________.

Accepted Answer

A)  CH3NH2
B)  CH3NH3+
C)  CH3NH3+
D)  CH3NH+
E)  none of the aboveF) C) and D)
G) B) and C)

Question 18

What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.153?

Accepted Answer

A)  4.15
B)  9.85
C)  1.42 × 10-10
D)  7.03 × 10-5
E)  none of the aboveF) A) and B)
G) C) and D)

Question 19

The Ka for HCN is 4.9 × 10-10. What is the value of Kb for CN-?

Accepted Answer

A)  2.0 × 10-5
B)  4.0 × 10-6
C)  4.9 × 104
D)  4.9 × 10-24
E)  2.0 × 109F) B) and C)
G) B) and E)

Question 20

Of the following substances, an aqueous solution of __________ will form basic solutions. NaHS Cu(NO3) 2 KHCO3 NaF

Accepted Answer

A)  NaHS, Cu(NO3) 2
B)  KHCO3, NaHS
C)  NaF only
D)  NaF, KHCO3
E)  NaHS, KHCO3 and NaFF) A) and B)
G) A) and C)

Exam 16: Acid-Base Equilibria

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

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What is the pOH of an aqueous solution at 25.0°C in which [H+] is 0.0025 M?

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

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Of the following substances, an aqueous solution of __________ will form basic solutions. NH4Cl Cu(NO3) 2 K2CO3 NaF

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Of the following substances, an aqueous solution of __________ will form basic solutions. NaHS Cu(NO3) 2 KHCO3 NaF

Correct AnswerverifiedShow Answer

Calculate the concentration (in M) of hydroxide ions in a solution at 25.0°C with a pOH of 4.223.

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Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.

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What is the pOH of an aqueous solution at 25.0 °C in which [OH-] is 0.0040 M?

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Ammonia is a __________.

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Which solution below has the highest concentration of hydroxide ions?

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Kb for NH3 is 1.8 × 10-5. What is the pH of a 0.45 M aqueous solution of NH4Cl at 25.0 °C?

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The molar concentration of hydronium ion in pure water at 25°C is __________.

Correct AnswerverifiedShow Answer

What is the concentration (in M) of hydronium ions in a solution at 25.0 °C with pH = 4.153?

Correct AnswerverifiedShow Answer

Calculate the pOH of 0.716 M anilinium hydrochloride (C6H5NH3Cl) solution in water, given that Kb for aniline is 3.83 × 10-4.

Correct AnswerverifiedShow Answer

The base-dissociation constant, Kb, for pyridine, C5H5N, is 1.4 × 10-9. The acid-dissociation constant, Ka, for the pyridinium ion, C5H5NH+, is __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following statements regarding Kw is false?

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The conjugate acid of CH3NH2 is __________.

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The Ka of hydrazoic acid (HN3) is 1.9 × 10-5 at 25.0°C. What is the pH of a 0.40 M aqueous solution of HN3?

Correct AnswerverifiedShow Answer

The Ka for HCN is 4.9 × 10-10. What is the value of Kb for CN-?

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

Correct Answer
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What is the pOH of an aqueous solution at 25.0°C in which [H⁺] is 0.0025 M?

Correct Answer
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Correct Answer
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Of the following substances, an aqueous solution of __________ will form basic solutions. NH₄Cl Cu(NO₃) ₂ K₂CO₃ NaF

Correct Answer
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Of the following substances, an aqueous solution of __________ will form basic solutions. NaHS Cu(NO₃) ₂ KHCO₃ NaF

Correct Answer
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Correct Answer
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Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10^-¹⁰ M hydronium ions.

Correct Answer
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What is the pOH of an aqueous solution at 25.0 °C in which [OH^-] is 0.0040 M?

Correct Answer
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Correct Answer
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Correct Answer
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K_b for NH₃is 1.8 × 10^-5. What is the pH of a 0.45 M aqueous solution of NH₄Cl at 25.0 °C?

Correct Answer
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Correct Answer
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Correct Answer
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Calculate the pOH of 0.716 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 base-dissociation constant, K_b, for pyridine, C₅H₅N, is 1.4 × 10^-9. The acid-dissociation constant, K_a, for the pyridinium ion, C₅H₅NH⁺, is __________.

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

Correct Answer
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Which one of the following statements regarding K_w is false?

Correct Answer
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The conjugate acid of CH₃NH₂ is __________.

Correct Answer
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The K_a of hydrazoic acid (HN₃) is 1.9 × 10^-5 at 25.0°C. What is the pH of a 0.40 M aqueous solution of HN₃?

Correct Answer
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The K_a for HCN is 4.9 × 10^-10. What is the value of K_b for CN^-?

Correct Answer
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