Question 1

What is the pH of a 0.050 M LiOH solution?

Accepted Answer

A)   
B)   1.30
C)   3.00
D)   11.00
E)   12.70F) B) and E)
G) All of the above

Question 2

Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 × 10-9. What is the pH of a 0.025 M HONH2 solution?

Accepted Answer

A)   2.90
B)   4.82
C)   9.18
D)   9.91
E)   11.10F) B) and E)
G) C) and E)

Question 3

All Brønsted-Lowry bases have at least one lone pair of electrons.

Accepted Answer

A) True 
 B)False

Question 4

Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10-4, K2 = 5.6 × 10-8, and K3 = 3 × 10-13. What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?

Accepted Answer

A)   9.4 × 10-3 M
B)   2.5 × 10-4 M
C)   8.8 × 10-5 M
D)   5.6 × 10-8 M
E)   None of these choices are correct.F) B) and D)
G) D) and E)

Question 5

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) All of the above
G) A) and B)

Question 6

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) B) and D)

Question 7

Formic acid, which is a component of insect venom, has a Ka = 1.8 × 10-4. What is the [H3O+] in a solution that is initially 0.10 M formic acid, HCOOH?

Accepted Answer

A)   4.2 × 10-3 M
B)   8.4 × 10-3 M 
C)   1.8 × 10-4 M
D)   1.8 × 10-5 M
E)   1.8 × 10-6 MF) A) and B)
G) A) and C)

Question 8

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

Accepted Answer

A)   0.022 M
B)   0.052 M
C)   0.15 M
D)   0.29 M
E)   None of these choices are correct.F) C) and D)
G) D) and E)

Question 9

Which of the following is a Lewis base?

Accepted Answer

A)   BCl3
B)   Cu2+
C)   Cl-
D)   Mn2+
E)   NH4+F) A) and E)
G) None of the above

Question 10

Which of the following is not a characteristic property of bases?

Accepted Answer

A)   taste bitter
B)   turn litmus from pink to blue
C)   neutralize acids
D)   react with carbonates to produce carbon dioxide gas
E)   feel slipperyF) A) and B)
G) B) and C)

Question 11

Which of the following liquids contains the strongest acid?

Accepted Answer

A)   0.1 M HA, pH = 6.85
B)   0.1 M HD, pH = 7.22
C)   0.1 M HE, pH = 8.34
D)   0.1 M HJ, pH = 11.88
E)   pure waterF) B) and C)
G) B) and D)

Question 12

The substance (CH3CH2) 2NH is considered

Accepted Answer

A)   a weak acid.
B)   a weak base.
C)   a strong acid.
D)   a strong base.
E)   a neutral compound.F) B) and E)
G) B) and C)

Question 13

Phosphoric acid, H3PO4, is a triprotic acid, for which Ka1 = 7.2 × 10-3, Ka2 = 6.3 × 10-8 and Ka3 = 4.2 × 10-13. What is the value of Kb for the hydrogen phosphate anion, HPO4?

Accepted Answer

A)   6.3 × 10-8
B)   4.2 × 10-13
C)   1.4 × 10-12
D)   1.6 × 10-7
E)   2.4 × 10-2F) A) and C)
G) B) and C)

Question 14

The chloride ion, Cl-, is a typical Lewis acid.

Accepted Answer

A) True 
 B)False

Question 15

The substance NH3 is considered

Accepted Answer

A)   a weak acid.
B)   a weak base.
C)   a strong acid.
D)   a strong base.
E)   a neutral compound.F) A) and C)
G) A) and D)

Question 16

All Brønsted-Lowry bases contain the hydroxide ion, OH-.

Accepted Answer

A) True 
 B)False

Question 17

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) A) and B)
G) B) and C)

Question 18

Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

Accepted Answer

A) True 
 B)False

Question 19

The substance Ca(OH) 2 is considered

Accepted Answer

A)   a weak Arrhenius acid.
B)   a weak Arrhenius base.
C)   a strong Arrhenius acid.
D)   a strong Arrhenius base.
E)   a neutral compound.F) C) and D)
G) A) and E)

Question 20

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2)  = 1.5 × 10-10

Accepted Answer

A)   0.38
B)   5.91
C)   8.09
D)   9.82
E)   13.62F) A) and B)
G) B) and E)

Exam 18: Acid-Base Equilibria

Which of the following is a Lewis base?

Correct AnswerverifiedShow Answer

Phosphoric acid, H3PO4, is a triprotic acid, for which Ka1 = 7.2 × 10-3, Ka2 = 6.3 × 10-8 and Ka3 = 4.2 × 10-13. What is the value of Kb for the hydrogen phosphate anion, HPO4?

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Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H3O+] for a 0.20 M solution of picric acid?

Correct AnswerverifiedShow Answer

The substance Ca(OH) 2 is considered

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All Brønsted-Lowry bases contain the hydroxide ion, OH-.

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The substance (CH3CH2) 2NH is considered

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Arrhenius bases raise the hydroxide ion concentration when dissolved in water.

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Which of the following liquids contains the strongest acid?

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Which of the following is not a characteristic property of bases?

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

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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?

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Formic acid, which is a component of insect venom, has a Ka = 1.8 × 10-4. What is the [H3O+] in a solution that is initially 0.10 M formic acid, HCOOH?

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What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2) = 1.5 × 10-10

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All Brønsted-Lowry bases have at least one lone pair of electrons.

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The substance NH3 is considered

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What is the pH of a 0.050 M LiOH solution?

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Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 × 10-9. What is the pH of a 0.025 M HONH2 solution?

Correct AnswerverifiedShow Answer

Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10-4, K2 = 5.6 × 10-8, and K3 = 3 × 10-13. What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?

Correct AnswerverifiedShow Answer

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

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The chloride ion, Cl-, is a typical Lewis acid.

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Correct Answer
verified

Phosphoric acid, H₃PO₄, is a triprotic acid, for which K_a1 = 7.2 × 10^-3, K_a2 = 6.3 × 10^-8 and K_a3 = 4.2 × 10^-13. What is the value of K_b for the hydrogen phosphate anion, HPO₄?

Correct Answer
verified

Picric acid has been used in the leather industry and in etching copper. However, its laboratory use has been restricted because it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of 0.42. What is the [H₃O⁺] for a 0.20 M solution of picric acid?

Correct Answer
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The substance Ca(OH) ₂ is considered

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All Brønsted-Lowry bases contain the hydroxide ion, OH^-.

Correct Answer
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The substance (CH₃CH₂) ₂NH is considered

Correct Answer
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Correct Answer
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Correct Answer
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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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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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Formic acid, which is a component of insect venom, has a K_a = 1.8 × 10^-4. What is the [H₃O⁺] in a solution that is initially 0.10 M formic acid, HCOOH?

Correct Answer
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What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂) = 1.5 × 10^-10

Correct Answer
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Correct Answer
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The substance NH₃ is considered

Correct Answer
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Correct Answer
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Hydroxylamine, HONH₂, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has K_b of 9.1 × 10^-9. What is the pH of a 0.025 M HONH₂ solution?

Correct Answer
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Arsenic acid, H₃AsO₄, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K₁ = 2.5 × 10^-4, K₂ = 5.6 × 10^-8, and K₃ = 3 × 10^-13. What is the concentration of the HAsO₄^2- in a solution whose initial arsenic acid concentration was 0.35 M?

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

Correct Answer
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The chloride ion, Cl^-, is a typical Lewis acid.

Correct Answer
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