Q: Which of the following best describes the autoionization of water at $25^\circ\mathrm{C}$?

$[H_3O^+] = [OH^-] = 1.0 \times 10^{-7}\ \mathrm{M}$

Q: Which of the following solutions is neutral at $25^\circ\mathrm{C}$?

$[H_3O^+] = 1.0 \times 10^{-7}\ \mathrm{M}$

Q: Which of the following is the strongest acid among the following, based on their $K_a$ values?

Hydrofluoric acid, $K_a = 7.2 \times 10^{-4}$

Q: A solution has a pH of $5.80$. What is the $[OH^-]$ in this solution at $25^\circ\mathrm{C}$?

$6.31 \times 10^{-9}\ \mathrm{M}$

Question 1

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

Accepted Answer

The stronger the acid, the weaker its conjugate base.

Question 2

Given a solution with $[H_3O^+] = 1.0 	imes 10^{-4}\ \mathrm{M}$ at $25^\circ\mathrm{C}$, what is the pH of the solution?

Accepted Answer

$4.00$

Question 3

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

Accepted Answer

NaC2H3O2

Question 4

What is the value of $K_b$ for the formate ion ($CHO_2^-$) if $K_a$ for formic acid ($HCHO_2$) is $1.8 	imes 10^{-4}$ at $25^\circ\mathrm{C}$? ($K_w = 1.0 	imes 10^{-14}$)

Accepted Answer

$5.6 	imes 10^{-11}$

Question 5

Which of the following is an example of a Lewis acid?

Accepted Answer

BF3

Question 6

A $0.10\ \mathrm{M}$ solution of a weak monoprotic acid, HA, has a pH of $2.95$. What is the percent ionization of the acid?

Accepted Answer

$1.4\%$

Question 7

Which of the following best describes the autoionization of water at $25^\circ\mathrm{C}$?

Accepted Answer

$[H_3O^+] = [OH^-] = 1.0 	imes 10^{-7}\ \mathrm{M}$

Question 8

Which of the following is the correct expression for the acid ionization constant ($K_a$) for acetic acid ($CH_3COOH$)?

Accepted Answer

$K_a = \dfrac{[CH_3COO^-][H_3O^+]}{[CH_3COOH]}$

Question 9

A solution has a pOH of $3.00$ at $25^\circ\mathrm{C}$. What is its pH?

Accepted Answer

$11.00$

Question 10

Which of the following is true for a polyprotic acid such as $H_3PO_4$?

Accepted Answer

The first ionization constant ($K_{a1}$) is greater than the second ($K_{a2}$).

Question 11

Which of the following best describes the pH of a $0.10\ \mathrm{M}$ NaOH solution at $25^\circ\mathrm{C}$?

Accepted Answer

$pH = 13.00$

Question 12

Which of the following is the correct relationship between $pK_a$, $pK_b$, and $pK_w$ at $25^\circ\mathrm{C}$?

Accepted Answer

$pK_a + pK_b = pK_w$

Question 13

Which of the following is a correct Brønsted-Lowry acid-base reaction?

Accepted Answer

$NH_3(aq) + H_2O(l) \rightarrow NH_4^+(aq) + OH^-(aq)$

Question 14

A $0.15\ \mathrm{M}$ solution of acetic acid ($CH_3COOH$) has a $[H^+]$ of $1.6 	imes 10^{-3}\ \mathrm{M}$. What is the percent ionization?

Accepted Answer

$1.1\%$

Question 15

Which of the following best describes a Lewis base?

Accepted Answer

An electron pair donor

Question 16

Which of the following solutions is neutral at $25^\circ\mathrm{C}$?

Accepted Answer

$[H_3O^+] = 1.0 	imes 10^{-7}\ \mathrm{M}$

Question 17

Which of the following is the strongest acid among the following, based on their $K_a$ values?

Accepted Answer

Hydrofluoric acid, $K_a = 7.2 	imes 10^{-4}$

Question 18

A solution has a pH of $5.80$. What is the $[OH^-]$ in this solution at $25^\circ\mathrm{C}$?

Accepted Answer

$6.31 	imes 10^{-9}\ \mathrm{M}$

Chapter 16 Study Guide

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