Question 1

Which of the following best explains why hydrochloric acid (HCl) is considered a strong acid in aqueous solution?

Accepted Answer

HCl completely ionizes in water, producing a high concentration of $$\mathrm{H_3O^+}$$ ions.

Question 2

Which of the following is NOT a property commonly associated with acids?

Accepted Answer

Bitter taste

Question 3

According to the Brønsted–Lowry definition, which of the following acts as a base in the reaction $$\mathrm{NH_3$(aq) + H_2O(l) \rightleftharpoons NH_4$^+(aq) + OH^-(aq)}$$?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 4

Which of the following acids is a weak acid?

Accepted Answer

Acetic acid ($$\mathrm{HC_2H_3O_2})$$

Question 5

A solution has a $$[\mathrm{H_3O^+}] of$$ $$1 	imes 10$$^{-4}$$ M. What is the pH of this solution?

Accepted Answer

$$4$$

Question 6

Which of the following statements about the autoionization of water is correct?

Accepted Answer

Water molecules can act as both acids and bases, producing $$\mathrm{H_3O^+}$$ and $$\mathrm{OH^-}$$ ions.

Question 7

Which of the following salts will produce a basic solution when dissolved in water?

Accepted Answer

NaF

Question 8

Which of the following best describes a Lewis acid?

Accepted Answer

A substance that accepts an electron pair

Question 9

Which of the following pairs is NOT a conjugate acid–base pair?

Accepted Answer

$$\mathrm{H_2SO_4}$$ and $$\mathrm{H_2SO_3}$$

Question 10

Which of the following solutions has the greatest percent ionization for acetic acid ($$\mathrm{HC_2H_3O_2}$$)?

Accepted Answer

0.0100 M $$\mathrm{HC_2H_3O_2}$$

Question 11

Which of the following best explains why acid rain is harmful to limestone buildings?

Accepted Answer

Acids react with the carbonate in limestone, causing it to dissolve.

Question 12

Which of the following statements is true regarding the relationship between $$K_a$$ and $$pK_a$$ for acids?

Accepted Answer

A larger $$K_a$$ corresponds to a smaller $$pK_a$$, indicating a stronger acid.

Question 13

Which of the following compounds acts as a weak base when dissolved in water?

Accepted Answer

F$$^-$$

Question 14

A solution is prepared by dissolving 0.10 M $$\mathrm{NH_4Cl} in $$water. What is the expected pH of the solution?

Accepted Answer

The solution will be acidic because $$\mathrm{NH_4$^+} is a $$weak acid.

Question 15

Which of the following best describes why $$\mathrm{HF} is a $$weak acid while $$\mathrm{HCl} is a $$strong acid?

Accepted Answer

$$\mathrm{HF}$$ has a stronger bond between H and F, making it less likely to ionize.

Question 16

Which of the following is the correct expression for the ion product constant of water ($$K_w) at 25$$°C?

Accepted Answer

$$K_w = [H_3O^+][OH^-] = 1 	imes 10$$^{-14}$$

Question 17

Which of the following household products is most likely to contain a strong base?

Accepted Answer

Drain cleaner

Question 18

Which of the following statements about polyprotic acids is correct?

Accepted Answer

Polyprotic acids can donate more than one proton per molecule.

Question 19

Which of the following best explains why the acidity of oxyacids increases with the number of oxygen atoms bonded to the central atom?

Accepted Answer

More oxygen atoms increase the oxidation state of the central atom, stabilizing the conjugate base.

Acids and Bases: Structure, Properties, and Reactions

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