Question 1

A 1.25 M solution of the weak acid HA is 9.2% dissociated. What is the pH of the solution?

Accepted Answer

A)  0.64
B)  0.94
C)  1.13
D)  2.16
E)  None of these choices are correct.F) None of the above
G) A) and E)

Question 2

The substance HOBr 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) All of the above
G) B) and D)

Question 3

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

Accepted Answer

A) True 
 B)False  False

Question 4

Which, if any, of the following acids is strong?

Accepted Answer

A)  Phosphoric
B)  Carbonic
C)  Acetic
D)  Water
E)  None of these choices are correct.F) A) and B)
G) A) and C)

Question 5

All weak acids have strong conjugate bases.

Accepted Answer

A) True 
 B)False

Question 6

Which one of the following will give a solution with a pH > 7, but is not an Arrhenius base in the strict sense?

Accepted Answer

A)  CH 3NH 2
B)  NaOH
C)  CO 2
D)  Ca(OH) 2
E)  CH 4F) A) and D)
G) A) and C)

Question 7

What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

Accepted Answer

A)  2.34 × 10 −4  M
B)  2.29 × 10 −6  M
C)  4.37 × 10 −9  M
D)  4.27 × 10 −11  M
E)  8.360 MF) None of the above
G) A) and B)

Question 8

The ammonium ion, NH4+, is a weak acid.

Accepted Answer

A) True 
 B)False

Question 9

Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH4Cl, is correct?

Accepted Answer

A)  The solution is weakly basic.
B)  The solution is strongly basic.
C)  The solution is neutral.
D)  The solution is acidic.
E)  The values for K a and K b for the species in solution must be known before a prediction can be made.F) B) and C)
G) A) and B)

Question 10

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

Question 11

A solution is prepared by adding 0.10 mol of sodium sulfide, Na2S, 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 concentration of sodium ions and sulfide ions will be identical.
E)  The concentration of sulfide ions will be greater than the concentration of sodium ions.F) A) and B)
G) A) and C) A

Question 12

Kw = 1.0 × 10−14, regardless of temperature.

Accepted Answer

A) True 
 B)False

Question 13

What is the pH of a 0.20 M HCl solution?

Accepted Answer

A)  
B)  0.70
C)  1.61
D)  12.39
E)  13.30F) D) and E)
G) A) and D)

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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) A) and B)
G) A) and E)

Question 16

Which one of the following pairs is not a conjugate acid-base pair?

Accepted Answer

A)  H 2O/OH −
B)  H 2O 2/HO 2 −
C)  OH −/O 2−
D)  H 2PO 4 −/HPO 4 2−
E)  HCl/H +F) B) and E)
G) B) and C)

Question 17

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) C) and D)
G) B) and E) D

Question 18

All Lewis acids contain at least one proton.

Accepted Answer

A) True 
 B)False

Question 19

Which, if any, of the following is an example of the leveling effect?

Accepted Answer

A)  The concentrations of H+ and OH- in pure water are equal.
B)  The number of strong acids equals the number of strong bases.
C)  The number of strong acids equals the number of weak acids.
D)  In water, no acid stronger than H 3O + can exist.
E)  None of these are examples of the leveling effect.F) D) and E)
G) C) and D)

Question 20

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

Exam 18: Acid-Base Equilibria

A 1.25 M solution of the weak acid HA is 9.2% dissociated. What is the pH of the solution?

Correct AnswerverifiedShow Answer

The substance HOBr is considered

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

Which, if any, of the following acids is strong?

Correct AnswerverifiedShow Answer

All weak acids have strong conjugate bases.

Correct AnswerverifiedShow Answer

Which one of the following will give a solution with a pH > 7, but is not an Arrhenius base in the strict sense?

Correct AnswerverifiedShow Answer

What is the [H3O+] for a solution at 25°C that has pOH = 5.640?

Correct AnswerverifiedShow Answer

The ammonium ion, NH4+, is a weak acid.

Correct AnswerverifiedShow Answer

Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH4Cl, is correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A solution is prepared by adding 0.10 mol of sodium sulfide, Na2S, to 1.00 L of water. Which statement about the solution is correct?

Correct AnswerverifiedA

Kw = 1.0 × 10−14, regardless of temperature.

Correct AnswerverifiedShow Answer

What is the pH of a 0.20 M HCl solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The substance (CH3CH2) 2NH is considered

Correct AnswerverifiedShow Answer

Which one of the following pairs is not a conjugate acid-base pair?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

All Lewis acids contain at least one proton.

Correct AnswerverifiedShow Answer

Which, if any, of the following is an example of the leveling effect?

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?

Correct AnswerverifiedShow Answer

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

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False

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What is the [H₃O⁺] for a solution at 25°C that has pOH = 5.640?

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The ammonium ion, NH₄⁺, is a weak acid.

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Ammonium chloride is used as an electrolyte in dry cells. Which of the following statements about a 0.10 M solution of NH₄Cl, is correct?

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

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A solution is prepared by adding 0.10 mol of sodium sulfide, Na₂S, to 1.00 L of water. Which statement about the solution is correct?

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A

Kw = 1.0 × 10⁻¹⁴, regardless of temperature.

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The substance (CH₃CH₂) ₂NH is considered

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D

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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
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