Question 1

Which of the following acids is classified as a strong acid and will completely dissociate in water?

Accepted Answer

Hydrochloric acid, $\mathrm{HCl}$

Question 2

Which of the following statements best explains why $\mathrm{HCl}$ is a strong acid?

Accepted Answer

The attraction between $\mathrm{H^+}$ and $\mathrm{Cl^-}$ is weak, resulting in complete ionization.

Question 3

Which of the following bases is considered a strong base and will completely dissociate in water?

Accepted Answer

Potassium hydroxide, $\mathrm{KOH}$

Question 4

Which of the following is the correct dissociation equation for acetic acid ($\mathrm{HC_2H_3O_2}$) in water?

Accepted Answer

$\mathrm{HC_2H_3O_2} + \mathrm{H_2O} \rightleftharpoons \mathrm{H_3O^+} + \mathrm{C_2H_3O_2^-}$

Question 5

Which acid has the lowest percent ionization at a concentration of 1.0 M, based on the provided table?

Accepted Answer

Acid 4

Question 6

What is the correct equilibrium expression for the ionization constant ($K_a$) of formic acid ($\mathrm{HCHO_2}$)?

Accepted Answer

$K_a = \dfrac{[\mathrm{H^+}][\mathrm{CHO_2^-}]}{[\mathrm{HCHO_2}]}$

Question 7

A solution of $0.100\ \mathrm{M}$ $\mathrm{NaOH}$ is titrated with $0.100\ \mathrm{M}$ $\mathrm{HCl}$. What is the pH at the equivalence point?

Accepted Answer

pH = 7

Question 8

Which of the following best describes the relationship between acid strength and conjugate base strength?

Accepted Answer

A strong acid has a very weak conjugate base.

Question 9

Which of the following acids will have the highest percent ionization at the same concentration?

Accepted Answer

Hydrochloric acid, $\mathrm{HCl}$

Question 10

Which of the following is the correct formula for calculating pH?

Accepted Answer

$\mathrm{pH} = -\log [\mathrm{H^+}]$

Question 11

Which of the following statements about the titration of a weak acid with a strong base is correct?

Accepted Answer

The equivalence point occurs at pH > 7.

Question 12

Which of the following pairs would make a buffer solution?

Accepted Answer

Acetic acid ($\mathrm{HC_2H_3O_2}$) and sodium acetate ($\mathrm{NaC_2H_3O_2}$)

Question 13

Which of the following is the correct relationship for the ion product constant of water ($K_w$) at $25^\circ$C?

Accepted Answer

$K_w = [\mathrm{H^+}][\mathrm{OH^-}] = 1.0 	imes 10^{-14}$

Question 14

Which of the following acids is the weakest based on its $K_a$ value?

Accepted Answer

Hydrocyanic acid, $\mathrm{HCN}$ ($K_a = 6.2 	imes 10^{-10}$)

Question 15

Which of the following best describes the effect of increasing the concentration of a weak acid on its percent ionization?

Accepted Answer

Percent ionization decreases with increasing concentration.

Question 16

Which of the following is the correct net ionic equation for the neutralization reaction between $\mathrm{HCl}$ and $\mathrm{NaOH}$?

Accepted Answer

$\mathrm{H^+} + \mathrm{OH^-} \rightarrow \mathrm{H_2O}$

Question 17

Which of the following acids will have the strongest acid strength based on the number of oxygen atoms present?

Accepted Answer

HClO_4

Question 18

Which of the following statements is true regarding the pH at the equivalence point in the titration of a weak base with a strong acid?

Accepted Answer

The pH at the equivalence point is less than 7.

Acids, Bases, and Acid-Base Equilibria: Study Guide

Study Guide - Practice Questions