Question 1

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the Ka for the acid?

Accepted Answer

A)  0.36
B)  2.4  ×	imes×  10-2
C)  7.8  ×	imes×  10-3
D)  1.5  ×	imes×  10-5
E)  None of these choices is correct. F) C) and D)
G) All of the above

Question 2

The substance NaNO3 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) A) and D)
G) A) and C) E

Question 3

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

Accepted Answer

A)  11.69
B)  8.68
C)  5.32
D)  2.31
E)  < 2.0 F) A) and B)
G) C) and E) A

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

A solution is prepared by adding 0.10 mol of iron(III) nitrate,Fe(NO3) 3,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 value of Ka for the species in solution must be known before a prediction can be made.
E)  The value of Kb for the species in solution must be known before a prediction can be made.F) C) and D)
G) None of the above

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

All strong acids have weak conjugate bases.

Accepted Answer

A) True 
 B)False

Question 8

Select the pair of substances which is not a conjugate acid-base pair.

Accepted Answer

A)  H3O+,H2O
B)  HNO2,NO2-
C)  H2SO4,HSO4-
D)  H2S,S2-
E)  NH3,NH2-F) D) and E)
G) A) and E)

Question 9

Which of the following is the strongest acid?

Accepted Answer

A)  CH3COOH
B)  HF
C)  H3PO4
D)  H2SO3
E)  HIF) A) and C)
G) B) and E)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Which of the following acids has the lowest pH?
0.1 M HBO,pKa = 2.43
0.1 M HA,pKa = 4.55
0.1 M HMO,pKa = 8.23
0.1 M HST,pKa = 11.89
Pure water

Accepted Answer

A)  HA
B)  HST
C)  HMO
D)  HBO
E)  pure waterF) A) and E)
G) A) and C)

Question 12

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

Question 13

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which species,if any,acts as a Lewis acid this reaction?

Accepted Answer

A)  ICl4-
B)  ICl 3
C)  Cl-
D)  the solvent
E)  None of the species acts as a Lewis acid in this reaction.F) A) and B)
G) A) and C)

Question 14

Which one of the following is a strong acid?

Accepted Answer

A)  H2CO3
B)  H2SO3
C)  H2SO4
D)  H3PO4
E)  CH3COOHF) A) and E)
G) A) and C)

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 B)
G) All of the above

Question 16

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 is correct.F) A) and B)
G) B) and C)

Question 17

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

Accepted Answer

A)   > 10-5 M
B)  1.22  ×	imes×  10-6 M
C)  8.23  ×	imes×  10-12 M
D)  1.22  ×	imes×  10-13 M
E)  8.23  ×	imes×  10-16 M F) B) and E)
G) A) and B)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)  phosphoric
B)  carbonic
C)  acetic
D)  water
E)  None of these choices is correct.F) A) and C)
G) C) and D)

Question 20

Kw = 1.0 $\times$ 10-14,regardless of temperature.

Accepted Answer

A) True 
 B)False  False

Exam 18: Acid-Base Equilibria

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the Ka for the acid?

Correct AnswerverifiedShow Answer

The substance NaNO3 is considered

Correct AnswerverifiedE

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

A solution is prepared by adding 0.10 mol of iron(III) nitrate,Fe(NO3) 3,to 1.00 L of water.Which statement about the solution is correct?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All strong acids have weak conjugate bases.

Correct AnswerverifiedShow Answer

Select the pair of substances which is not a conjugate acid-base pair.

Correct AnswerverifiedShow Answer

Which of the following is the strongest acid?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following acids has the lowest pH? 0.1 M HBO,pKa = 2.43 0.1 M HA,pKa = 4.55 0.1 M HMO,pKa = 8.23 0.1 M HST,pKa = 11.89 Pure water

Correct AnswerverifiedShow Answer

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 AnswerverifiedShow Answer

Iodine trichloride,ICl3,will react with a chloride ion to form ICl4-.Which species,if any,acts as a Lewis acid this reaction?

Correct AnswerverifiedShow Answer

Which one of the following is a strong acid?

Correct AnswerverifiedShow Answer

The substance NH3 is considered

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Kw = 1.0 ×\times× 10-14,regardless of temperature.

Correct AnswerverifiedFalse

Butyric acid is responsible for the odor in rancid butter.A solution of 0.25 M butyric acid has a pH of 2.71.What is the K_a for the acid?

Correct Answer
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The substance NaNO₃ is considered

Correct Answer
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E

What is the pH of a 0.050 M triethylamine, (C₂H₅) ₃N,solution? K_b for triethylamine is 5.3 $\times$ 10^-4.

Correct Answer
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A

Correct Answer
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A solution is prepared by adding 0.10 mol of iron(III) nitrate,Fe(NO₃) ₃,to 1.00 L of water.Which statement about the solution is correct?

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

Correct Answer
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Which of the following acids has the lowest pH? 0.1 M HBO,pK_a = 2.43 0.1 M HA,pK_a = 4.55 0.1 M HMO,pK_a = 8.23 0.1 M HST,pK_a = 11.89 Pure water

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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Iodine trichloride,ICl₃,will react with a chloride ion to form ICl₄^-.Which species,if any,acts as a Lewis acid this reaction?

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

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

Correct Answer
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Correct Answer
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K_w = 1.0 $\times$ 10^-14,regardless of temperature.

Correct Answer
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False