$$ [\mathrm{H_3O^+}] = 1.0 \times 10^{-3} \ \mathrm{M} $$

$$ [H_3O^+] = 1.6 \times 10^{-3} \ \mathrm{M} $$

$$ [H_3O^+] = 2.0 \times 10^{-5} \ \mathrm{M} $$

$$ [H^+] = [OH^-] = 1.0 \times 10^{-7} \ \mathrm{M} $$

Question 1

Which of the following best describes a Lewis acid?

Accepted Answer

A substance that accepts an electron pair.

Question 2

Which equation correctly represents the auto-ionization of water?

Accepted Answer

$$ \mathrm{H_2O(l) + H_2O(l) \rightleftharpoons H_3O^+(aq) + OH^-(aq)} $$

Question 3

A solution has a pH of 3.0. What is the hydronium ion concentration?

Accepted Answer

$$ [\mathrm{H_3O^+}] = 1.0 	imes 10^{-3} \ \mathrm{M} $$

Question 4

Which of the following is NOT a strong acid?

Accepted Answer

HC2H3O2

Question 5

What is the pOH of a solution with $$[OH^-] = 2.9 	imes 10$$^{-4}$$ \ \mathrm{M}$$?

Accepted Answer

$$ \mathrm{pOH} = 3.54 $$

Question 6

Which of the following statements about the relationship between $$K_a$$ and acid strength is correct?

Accepted Answer

A larger $$K_a$$ value means a stronger acid.

Question 7

Calculate the pH of a 0.10 M HCl solution.

Accepted Answer

$$ \mathrm{pH} = 1.00 $$

Question 8

Which of the following best describes an Arrhenius base?

Accepted Answer

A substance that produces OH‒ ions in water.

Question 9

A 0.15 M acetic acid solution has $$K_a = 1.8 	imes 10$$^{-5}$$. What is the equilibrium concentration of H_3O$$^+$$?

Accepted Answer

$$ [H_3O^+] = 1.6 	imes 10^{-3} \ \mathrm{M} $$

Question 10

Which of the following is an example of an amphoteric substance?

Accepted Answer

H2O

Question 11

If the pH of a solution is 4.70, what is the $$[H_3O^+]$$?

Accepted Answer

$$ [H_3O^+] = 2.0 	imes 10^{-5} \ \mathrm{M} $$

Question 12

Which of the following is true for a neutral solution at 25°C?

Accepted Answer

$$ [H^+] = [OH^-] = 1.0 	imes 10^{-7} \ \mathrm{M} $$

Question 13

Which of the following is the correct expression for the acid dissociation constant ($$K_a) $$for a generic weak acid $$HA$$?

Accepted Answer

$$ K_a = \frac{[H_3O^+][A^-]}{[HA]} $$

Question 14

Which of the following statements about the effect of dilution on the percent ionization of a weak acid is correct?

Accepted Answer

Dilution increases the percent ionization.

Question 15

A solution has $$[OH^-] = 1.0 	imes 10$$^{-6}$$ \ \mathrm{M}. $$What is its pOH and how would you classify the solution?

Accepted Answer

$$ \mathrm{pOH} = 6.00 $$, basic

Question 16

Which of the following is the conjugate base of $$H_2O$$?

Accepted Answer

$$ OH^- $$

Question 17

Which of the following best describes the relationship between pH and $$[H_3O^+]$$?

Accepted Answer

As $$[H_3O^+]$$ increases, pH decreases.

Acids and Bases: Definitions, Properties, and Calculations

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