Question 1

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 M

Question 2

What is the pH of a 0.00200 M HClO4 solution?

Accepted Answer

A)  0.995
B)  1.378
C)  2.699
D)  6.215
E)  None of these choices are correct.

Question 3

Farmers who raise cotton once used arsenic acid, H3AsO4, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

Accepted Answer

A)  0.85
B)  1.96
C)  3.90
D)  4.51
E)  None of these choices are correct.

Question 4

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 water

Question 5

What is the pH of a 0.010 M triethanolammonium chloride, (HOC2H2) 3NHCl, solution?Kb, ((HOC2H2) 3N)  = 5.9 × 10−7

Accepted Answer

A)  2.75
B)  4.89
C)  9.11
D)  11.25
E)  None of these choices are correct.

Question 6

A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this acid?

Accepted Answer

A)  7.2 × 10 1
B)  0.16
C)  0.099
D)  0.0014
E)  0.00027

Question 7

All strong acids have weak conjugate bases.

Accepted Answer

A) True 
 B)False

Question 8

Select the pair of substances in that an acid is listed followed by its conjugate base.

Accepted Answer

A)  H +, HCl
B)  NH 3, NH 4 +
C)  HPO 4 2−, H 2PO 4 −
D)  HCO 3 −, CO 3 2−
E)  CH 3COOH, CH 3COOH 2 +

Question 9

Which of the following pairs has the stronger acid listed first?

Accepted Answer

A)  H 2AsO 3, H 2AsO 4
B)  HI, HBr
C)  HClO, HClO 3
D)  H 2S, HCl
E)  H 2SO 3, H 2SO 4

Question 10

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

Accepted Answer

A)  H 3O +, H 2O
B)  HNO 2, NO 2 −
C)  H 2SO 4, HSO 4 −
D)  H 2S, S 2−
E)  NH 3, NH 2 −

Question 11

Select the strongest acid from the following list.

Accepted Answer

A)  HBrO
B)  HBrO 2
C)  HClO 2
D)  HClO 3
E)  HIO

Question 12

According to Brønsted and Lowry, which one of the following is not a conjugate acid-base pair?

Accepted Answer

A)  H 3O +/OH −
B)  CH 3OH 2 +/CH 3OH
C)  HI/I −
D)  HSO 4 −/SO 4 2−
E)  H 2/H −

Question 13

The substance H2SO3 is considered

Accepted Answer

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

Question 14

The hydrated Al3+ ion, Al(H2O) 63+, is a weak acid in water. What are the products of its reaction with H2O?Al(H2O) 63+(aq)  + H2O(l)  → ?

Accepted Answer

A)  Al(H 2O) 5OH 2+( aq) + H 3O +( aq) 
B)  Al(H 2O) 6H 4+( aq) + OH −( aq) 
C)  Al(H 2O) 5 3+( aq) + 2H 2O( l) 
D)  Al(H 2O) 6OH 2+( aq) + H 3O +( aq) 
E)  Al(H 2O) 6 2+( aq) + H 3O +( aq)

Question 15

Select the correct relationship among the concentrations of species present in a 1.0 M aqueous solution of the weak acid represented by HA.

Accepted Answer

A)  [H 2O] > [A −] ~ [H 3O +] > [HA] > [OH −]
B)  [H 2O] > [HA] > [A −] > [H 3O +] > [OH −]
C)  [HA] > [H 2O] > [A −] > [H 3O +] > [OH −]
D)  [H 2O] > [HA] > [A −] ~ [H 3O +] > [OH −]
E)  [HA] > [H 2O] > [A −] ~ [H 3O +] > [OH −]

Question 16

Which of the following is the strongest base?

Accepted Answer

A)  CH 3NH 2
B)  NaNO 3
C)  B(OH) 3
D)  Al(OH) 3
E)  LiOH

Question 17

The substance HCl 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.

Question 18

Which of the following acids has the lowest pH?0.1 M HBO, pKa = 2.430.1 M HA, pKa = 4.550.1 M HMO, pKa = 8.230.1 M HST, pKa = 11.89pure water

Accepted Answer

A)  HA
B)  HST
C)  HMO
D)  HBO
E)  Pure water

Question 19

The substance HClO4 is considered

Accepted Answer

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

Question 20

A solution is prepared by adding 0.10 mol of potassium chloride, KCl, 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)  One needs to know the temperature before any of these predictions can be made.
E)  The values for K a and K b for the species in solution must be known before a prediction can be made.

Exam 18: Acid-Base Equilibria

The substance HCl is considered

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All strong acids have weak conjugate bases.

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The substance H2SO3 is considered

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Which of the following acids has the lowest pH?0.1 M HBO, pKa = 2.430.1 M HA, pKa = 4.550.1 M HMO, pKa = 8.230.1 M HST, pKa = 11.89pure water

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What is the pH of a 0.00200 M HClO4 solution?

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Which of the following liquids contains the strongest acid?

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Select the pair of substances in that an acid is listed followed by its conjugate base.

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The hydrated Al3+ ion, Al(H2O) 63+, is a weak acid in water. What are the products of its reaction with H2O?Al(H2O) 63+(aq) + H2O(l) → ?

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Select the correct relationship among the concentrations of species present in a 1.0 M aqueous solution of the weak acid represented by HA.

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What is the pH of a 0.010 M triethanolammonium chloride, (HOC2H2) 3NHCl, solution?Kb, ((HOC2H2) 3N) = 5.9 × 10−7

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Which of the following is the strongest base?

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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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Select the strongest acid from the following list.

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A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of Ka for this acid?

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The substance HClO4 is considered

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Which of the following pairs has the stronger acid listed first?

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Farmers who raise cotton once used arsenic acid, H3AsO4, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

Correct AnswerverifiedShow Answer

A solution is prepared by adding 0.10 mol of potassium chloride, KCl, to 1.00 L of water. Which statement about the solution is correct?

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

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According to Brønsted and Lowry, which one of the following is not a conjugate acid-base pair?

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Correct Answer
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Correct Answer
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The substance H₂SO₃is considered

Correct Answer
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Which of the following acids has the lowest pH?0.1 M HBO, pK_a = 2.430.1 M HA, pK_a = 4.550.1 M HMO, pK_a = 8.230.1 M HST, pK_a = 11.89pure water

Correct Answer
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What is the pH of a 0.00200 M HClO₄solution?

Correct Answer
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Correct Answer
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The hydrated Al³⁺ ion, Al(H₂O) ₆³⁺, is a weak acid in water. What are the products of its reaction with H₂O?Al(H₂O) ₆³⁺(aq) + H₂O(l) → ?

Correct Answer
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Correct Answer
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What is the pH of a 0.010 M triethanolammonium chloride, (HOC₂H₂) ₃NHCl, solution?K_b, ((HOC₂H₂) ₃N) = 5.9 × 10⁻⁷

Correct Answer
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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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Correct Answer
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A 0.15 M solution of chloroacetic acid has a pH of 1.86. What is the value of K_a for this acid?

Correct Answer
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The substance HClO₄is considered

Correct Answer
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Correct Answer
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Farmers who raise cotton once used arsenic acid, H₃AsO₄, as a defoliant at harvest time. 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 pH of a 0.500 M solution of arsenic acid?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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