Q: Which of the following is true about the $K_a$ and $K_b$ values for a conjugate acid-base pair?

If $K_a$ is large, $K_b$ is small

Q: If a salt contains an acidic cation and a basic anion, what determines the pH of the solution?

The relative strengths of the acid and base

Q: Which of the following is a correct method to calculate the pH of a solution of acetic acid?

Use the $K_a$ value and set up an ICE table

Q: Which of the following is a correct statement about the pH of salt solutions?

A salt from a weak acid and strong base will be basic

Question 1

Which of the following acids, when dissolved in water at 0.10 mol L$^{-1}$, would produce the most acidic solution?

Accepted Answer

Nitrous acid, $pK_a = 1.99$

Question 2

A solution contains 0.10 mol L$^{-1}$ HNO$_3$ and 0.10 mol L$^{-1}$ HF. Given $K_a$ for HF is $6.3 	imes 10^{-4}$, which acid contributes most to the H$_3$O$^+$ concentration?

Accepted Answer

HNO$_3$, because it is a strong acid and fully ionizes

Question 3

What is the relationship between $K_a$ and $K_b$ for a conjugate acid-base pair?

Accepted Answer

$K_a 	imes K_b = K_w$

Question 4

Which of the following ions will make an aqueous salt solution basic?

Accepted Answer

ClO$_2^-$

Question 5

A 0.25 mol L$^{-1}$ solution of sodium benzoate has a $pK_a$ of 4.19. What is the expected pH of the solution?

Accepted Answer

Greater than 7, because benzoate is the conjugate base of a weak acid

Question 6

Which of the following reactions describes the ionization of a weak acid HA in water?

Accepted Answer

$HA(aq) + H_2O(l) \rightarrow H_3O^+(aq) + A^-(aq)$

Question 7

If a salt is formed from a strong acid and a strong base, what will be the pH of its aqueous solution?

Accepted Answer

Neutral

Question 8

What is the percent ionization of a 2.5 mol L$^{-1}$ HNO$_2$ solution if $K_a = 4.6 	imes 10^{-4}$?

Accepted Answer

Much less than 100%, because HNO$_2$ is a weak acid

Question 9

Which of the following steps is NOT necessary when calculating the pH of a weak acid solution?

Accepted Answer

Assuming complete ionization

Question 10

A solution contains 0.10 mol L$^{-1}$ HNO$_3$ and 0.10 mol L$^{-1}$ HClO$_4$. $K_a$ for HNO$_3$ is $5.6 	imes 10^1$, $K_a$ for HClO$_4$ is $1.0 	imes 10^2$. Which acid will dominate the H$_3$O$^+$ concentration?

Accepted Answer

HClO$_4$, because it has a higher $K_a$

Question 11

Which of the following ions will make an aqueous salt solution acidic?

Accepted Answer

HSO$_4^-$

Question 12

What is the $pH$ of a solution that is 0.25 mol L$^{-1}$ in aspirin, given $K_a = 3.16 	imes 10^{-4}$?

Accepted Answer

$pH < 7$

Question 13

Which of the following is true about the $K_a$ and $K_b$ values for a conjugate acid-base pair?

Accepted Answer

If $K_a$ is large, $K_b$ is small

Question 14

Which of the following ions is considered non-reacting and will not affect the pH of a solution?

Accepted Answer

Li$^+$

Question 15

If a salt contains an acidic cation and a basic anion, what determines the pH of the solution?

Accepted Answer

The relative strengths of the acid and base

Question 16

Which of the following is a correct method to calculate the pH of a solution of acetic acid?

Accepted Answer

Use the $K_a$ value and set up an ICE table

Question 17

Which of the following is a property of a strong acid?

Accepted Answer

It ionizes completely in water

Question 18

Which of the following is a correct statement about the pH of salt solutions?

Accepted Answer

A salt from a weak acid and strong base will be basic

Question 19

Which of the following ions will make an aqueous salt solution neutral?

Accepted Answer

K$^+$

Acids, Bases, and Salt Solutions: Study Notes for General Chemistry I

Study Guide - Practice Questions

Study Guide - Flashcards