Q: Which of the following is the correct expression for the ion product constant of water ($$K_w$$)?

$$K_w = [\mathrm{H}_3\mathrm{O}^+] \times [\mathrm{OH}^-]$$

Q: A solution has $$[\mathrm{OH}^-] = 1.0 \times 10$$^{-8}$$\ \mathrm{M}. $$What is the $$[\mathrm{H}_3\mathrm{O}^+] in $$this solution at $$25^\circC$$?

$$1.0 \times 10$$^{-6}$$\ \mathrm{M}$$

Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout and the components are not visibly distinct.

Question 2

Which statement correctly describes the difference between electrolytes and nonelectrolytes?

Accepted Answer

Electrolytes conduct electricity in water because they dissociate into ions, while nonelectrolytes do not dissociate and do not conduct electricity.

Question 3

A solution is prepared by dissolving 0.5 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of NaCl in the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 4

Which of the following best explains why a 1.0 M solution of CaCl$$_2$$ contains twice as many equivalents of positive charge as a 1.0 M solution of NaCl?

Accepted Answer

Each Ca$$^{2+}$$ ion carries a $$+2$$ charge, so 1.0 mol of Ca$$^{2+}$$ provides 2 equivalents of positive charge.

Question 5

Which equation correctly represents the dissociation of HCl in water?

Accepted Answer

$$\mathrm{HCl} (aq) \rightarrow \mathrm{H}^+ (aq) + \mathrm{Cl}^- (aq)$$

Question 6

Which of the following is a correct statement about strong acids and weak acids?

Accepted Answer

Strong acids completely dissociate in water, while weak acids only partially dissociate.

Question 7

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

Accepted Answer

$$K_w = [\mathrm{H}_3\mathrm{O}^+] 	imes [\mathrm{OH}^-]$$

Question 8

If the concentration of $$[\mathrm{H}_3\mathrm{O}^+] in a $$solution is $$1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$, what is the pH of the solution?

Accepted Answer

$$4.0$$

Question 9

Which of the following statements about buffers is correct?

Accepted Answer

A buffer is a solution that resists changes in pH when small amounts of acid or base are added.

Question 10

A solution has $$[\mathrm{OH}^-] = 1.0 	imes 10$$^{-8}$$\ \mathrm{M}. $$What is the $$[\mathrm{H}_3\mathrm{O}^+] in $$this solution at $$25^\circC$$?

Accepted Answer

$$1.0 	imes 10$$^{-6}$$\ \mathrm{M}$$

Question 11

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

Accepted Answer

It completely dissociates in water to produce OH$$^-$$ ions.

Question 12

Which of the following is the correct net ionic equation for the reaction between HCl and NaOH?

Accepted Answer

$$\mathrm{H}^+ (aq) + \mathrm{OH}^- (aq) \rightarrow \mathrm{H}_2\mathrm{O} (l)$$

Question 13

Which of the following best describes the role of a buffer in blood?

Accepted Answer

It maintains the pH of blood within a narrow range, even when acids or bases are introduced.

Question 14

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

Accepted Answer

$$\mathrm{pH} = -\log [\mathrm{H}_3\mathrm{O}^+]$$

Question 15

A buffer solution is made by mixing acetic acid (CH$$_3$$COOH) and sodium acetate (CH$$_3$$COONa). Which component acts as the weak acid?

Accepted Answer

CH$$_3$$COOH

Question 16

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

Accepted Answer

Water dissociates very slightly, producing equal concentrations of H$$_3O$^+$$ and OH$$^-$$ ions.

Question 17

Which of the following is the correct relationship for $$K_w at$$ $$25^\circC$$?

Accepted Answer

$$K_w = 1.0 	imes 10$$^{-14}$$

Question 18

A solution has a pH of 2. What is the $$[\mathrm{H}_3\mathrm{O}^+]$$ concentration?

Accepted Answer

$$1.0 	imes 10$$^{-2}$$\ \mathrm{M}$$

Question 19

Which of the following is a characteristic property of acids?

Accepted Answer

They turn blue litmus paper red.

Study Guide: Solutions and Acids & Bases (Chapters 9 & 11)

Study Guide - Practice Questions

Study Guide - Flashcards