Question 1

Which of the following is a correct statement about carboxylic acids?

Accepted Answer

The acidic hydrogen atom in a carboxylic acid is bonded to an oxygen atom.

Question 2

Which of the following is NOT a strong acid according to the provided list?

Accepted Answer

CH\_3CO\_2H

Question 3

According to Arrhenius’ definition, what is the effect of adding a strong acid to water?

Accepted Answer

It increases the concentration of H\^+ ions.

Question 4

Which equation correctly represents the dissociation of a weak acid in water?

Accepted Answer

$$\mathrm{HA} \rightleftharpoons \mathrm{H}^+ + \mathrm{A}^-$$

Question 5

Which of the following best describes the relationship between $$K_a$$ and acid strength?

Accepted Answer

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

Question 6

Given the equilibrium $$\mathrm{HA} \rightleftharpoons \mathrm{H}^+ + \mathrm{A}^-$$, which expression correctly defines $$K_a$$?

Accepted Answer

$$K_a = \dfrac{[\mathrm{H}^+][\mathrm{A}^-]}{[\mathrm{HA}]}$$

Question 7

Which acid has the smallest $$pK_a$$ value among the following, and what does this indicate?

Accepted Answer

Chlorous acid; it is the strongest acid.

Question 8

If a solution contains 0.10 M acetic acid ($$K_a = 1.8 	imes 10$$^{-5}$$), which of the following statements is true?

Accepted Answer

Most acetic acid molecules will remain undissociated.

Question 9

Which of the following is a common misconception about strong acids?

Accepted Answer

Strong acids are always more concentrated than weak acids.

Question 10

Which of the following is the conjugate base of acetic acid ($$\mathrm{CH}_3\mathrm{CO}_2\mathrm{H}$$)?

Accepted Answer

$$\mathrm{CH}_3\mathrm{CO}_2^-$$

Question 11

Which of the following bases is commonly found in household cleaning products?

Accepted Answer

Sodium hydroxide

Question 12

Which statement best explains why weak acids are weak electrolytes?

Accepted Answer

They only partially ionize in solution.

Question 13

Which of the following is true regarding the $$pK_a of an $$acid?

Accepted Answer

A smaller $$pK_a$$ value indicates a stronger acid.

Question 14

Which of the following acids is expected to have the highest degree of ionization in water?

Accepted Answer

Nitric acid ($$\mathrm{HNO}_3)$$

Question 15

Which of the following is a correct statement about the $$K_a$$ values of weak acids?

Accepted Answer

Weak acids have $$K_a$$ values much less than 1.

Question 16

Which of the following is the correct formula for citric acid?

Accepted Answer

$$\mathrm{H}_3\mathrm{C}_6\mathrm{H}_5\mathrm{O}_7$$

Question 17

Which of the following is a property of strong acids?

Accepted Answer

They fully ionize in water.

Question 18

Which of the following is a common misconception about weak acids?

Accepted Answer

Weak acids are always present at low concentrations.

Question 19

Which of the following is a correct statement about the relationship between $$K_a$$ and $$pK_a$$?

Accepted Answer

$$pK_a = -\log K_a$$

Acid-Base Equilibria: Definitions, Strength, and Quantification

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