Question 1

What is the hydronium ion concentration of a 0. 500 mol L-1 acetic acid solution with Ka = 1.8 × 10-5? The equation for the dissociation of acetic acid is below: CH3CO2H(aq) +H2O(l)  ⇌ H3O+(aq) +CH3CO2-(aq)

Accepted Answer

A)   3.0 × 10-2 mol L-1
B)   4.2 × 10-2 mol L-1
C)   3.0 × 10-3 mol L-1
D)   4.2 × 10-3 mol L-1

Question 2

Calculate the pH of a 0.200 mol L-1 solution of formic acid, Ka = 1.8 × 10-4.

Accepted Answer

A)   3.84
B)   2.22
C)   4.62
D)   1.97
E)   3.07

Question 3

In a triprotic acid, which Ka has the highest value?

Accepted Answer

A)   Ka1
B)   Ka2
C)   Ka3
D)   Kb1
E)   Kb2

Question 4

Determine the [OH-] concentration of a 0.116 mol L-1 Ba(OH) 2 solution at 25 °C.

Accepted Answer

A)   4.310 × 10-14 mol L-1
B)   0.116 mol L-1
C)   0.232 mol L-1
D)   8.62 × 10-14 mol L-1
E)   0.058 mol L-1

Question 5

What is the autoionization of water?

Accepted Answer

Autoionization of water is the equilibri...

Question 6

Determine the pH of a 0.227 mol L-1 C5H5N solution at 25 °C. The Kb of C5H5N is 1.7 × 10-9.

Accepted Answer

A)   4.59
B)   9.41
C)   4.71
D)   10.14
E)   9.29

Question 7

Determine the pH of a 0.00598 mol L-1 HClO4 solution.

Accepted Answer

A)   1.777
B)   6.434
C)   7.566
D)   2.223
E)   3.558

Question 8

Which of the following is a weak acid?

Accepted Answer

A)   HClO4
B)   H2SO4
C)   HCl
D)   HCO2H
E)   HNO3

Question 9

Which of the following species is amphoteric?

Accepted Answer

A)   CO32-
B)   HCl
C)   NH4⁺
D)   HPO42-
E)   NaOH

Question 10

Match the following.
-Bronsted-Lowry acid

Accepted Answer

A)  electron pair donor
B)  produces protons in aqueous solution
C)  electron pair acceptor
D)  proton acceptor
E)  produces hydroxide ions in aqueous solutionF) proton donor

Question 11

What is the hydronium ion concentration of an acid rain sample that has a pH of 3. 45?

Accepted Answer

A)   2.82 × 10-11 mol L-1
B)   3.55 × 10-4 mol L-1
C)   3. 45 mol L-1
D)   10. 55 mol L-1

Question 12

Which of the following is a triprotic acid?

Accepted Answer

A)   HF
B)   H2SO4
C)   H3PO4
D)   H2SO3
E)   HC2H3O2

Question 13

On which equilibrium does the strength of an acid HA depend on?

Accepted Answer

A)   HA(aq)  + H2O(l)  ⇌ H2A+(aq)  + OH-(aq) 
B)   HA(aq)  + H2O(l)  ⇌ A-(aq)  + H3O+(aq) 
C)   HA(aq)  + H2O(l)  ⇌ H(HO) A-(aq)  + H+(aq) 
D)   HA(aq)  + OH-(aq)  ⇌ A-(aq)  + H2O(l) 
E)   HA(aq)  + HA(aq)  ⇌ H2A+(aq)  + A-(aq)

Question 14

Which one of the following salts, when dissolved in water, produces the solution with the lowest pH?

Accepted Answer

A)   NaCl
B)   KCl
C)   MgCl2
D)   AlCl3

Question 15

Identify the diprotic acid.

Accepted Answer

A)   HNO3
B)   HCl
C)   CH3COOH
D)   H2SO4
E)   HClO4

Question 16

Describe a molecule that can be a Lewis acid.

Accepted Answer

A molecule with an i...

Question 17

Determine the [OH-] concentration of a 0.741 mol L-1 KOH solution at 25 °C.

Accepted Answer

A)   1.34 × 10-13 mol L-1
B)   1.34 × 10-14 mol L-1
C)   0.741 mol L-1
D)   7.41 mol L-1
E)   7.41 × 10-13 mol L-1

Question 18

Calculate the pOH of an aqueous solution with a pH of 9.85 at 25 °C.

Accepted Answer

A)   2.15
B)   3.15
C)   4.15
D)   5.15
E)   4.00

Question 19

The pH of a solution is 9.12 at 25 °C. Calculate the pOH of this solution at 25 °C.

Accepted Answer

A)   2.40
B)   8.33
C)   4.88
D)   11.4
E)   12.7

Question 20

Which of the following is an acid-base neutral ion?

Accepted Answer

A)   Al3+
B)   CN-
C)   CO32-
D)   Cl-
E)   NH4+

Exam 15: Acids and Bases

Calculate the pH of a 0.200 mol L-1 solution of formic acid, Ka = 1.8 × 10-4.

Correct AnswerverifiedShow Answer

What is the hydronium ion concentration of an acid rain sample that has a pH of 3. 45?

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What is the autoionization of water?

Correct AnswerverifiedAutoionization of water is the equilibri...View AnswerShow Answer

Identify the diprotic acid.

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Which of the following is a triprotic acid?

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Describe a molecule that can be a Lewis acid.

Correct AnswerverifiedA molecule with an i...View AnswerShow Answer

Which of the following is a weak acid?

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Calculate the pOH of an aqueous solution with a pH of 9.85 at 25 °C.

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Determine the [OH-] concentration of a 0.116 mol L-1 Ba(OH) 2 solution at 25 °C.

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On which equilibrium does the strength of an acid HA depend on?

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Which one of the following salts, when dissolved in water, produces the solution with the lowest pH?

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Which of the following is an acid-base neutral ion?

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Which of the following species is amphoteric?

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Determine the pH of a 0.00598 mol L-1 HClO4 solution.

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The pH of a solution is 9.12 at 25 °C. Calculate the pOH of this solution at 25 °C.

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Determine the [OH-] concentration of a 0.741 mol L-1 KOH solution at 25 °C.

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Match the following. -Bronsted-Lowry acid

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Determine the pH of a 0.227 mol L-1 C5H5N solution at 25 °C. The Kb of C5H5N is 1.7 × 10-9.

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What is the hydronium ion concentration of a 0. 500 mol L-1 acetic acid solution with Ka = 1.8 × 10-5? The equation for the dissociation of acetic acid is below: CH3CO2H(aq) +H2O(l) ⇌ H3O+(aq) +CH3CO2-(aq)

Correct AnswerverifiedShow Answer

In a triprotic acid, which Ka has the highest value?

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Calculate the pH of a 0.200 mol L^-1 solution of formic acid, K_a = 1.8 × 10^-4.

Correct Answer
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Autoionization of water is the equilibri...
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Correct Answer
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Correct Answer
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A molecule with an i...
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Determine the [OH^-] concentration of a 0.116 mol L^-1 Ba(OH) ₂ solution at 25 °C.

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Correct Answer
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Determine the pH of a 0.00598 mol L^-1 HClO₄ solution.

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Determine the [OH^-] concentration of a 0.741 mol L^-1 KOH solution at 25 °C.

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Correct Answer
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Determine the pH of a 0.227 mol L^-1 C₅H₅N solution at 25 °C. The K_b of C₅H₅N is 1.7 × 10^-9.

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What is the hydronium ion concentration of a 0. 500 mol L^-1 acetic acid solution with K_a = 1.8 × 10^-5? The equation for the dissociation of acetic acid is below: CH₃CO₂H(aq) +H₂O(l) ⇌ H₃O+(aq) +CH₃CO₂^-(aq)

Correct Answer
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In a triprotic acid, which K_a has the highest value?

Correct Answer
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