Self Quiz Answers

1. When HI dissolves in water, which ions are formed?

a. H₃O⁺ and H₂I⁺
*b. H₃O⁺ and I^-
c. H₃O⁺ and OH^-
d. OH^- and H₂I⁺
e. OH^- and I^-

2. Which of the following properties would indicate an acid?

I. pH less than 7
II. Turns litmus paper to a blue color.
III. Turns phenolphthalein to a pink color.

*a. I only
b. II only
c. I and II
d. I and III
e. II and III

 3. Which of the following reactions would indicate a base?

a. reacts with water to give H₃O⁺
b. reacts with water to give H₂
c. reacts with a metal to give H₂
d. reacts with HCO₃^- to give CO₂
*e. reacts with NH₄⁺ to give NH₃

 4. An electron pair acceptor is:

*a. an acid. (Lewis definition)
b. a base.

5. Write a complete balanced equation using the Arrhenius concept for the reaction between sulfuric acid and potassium hydroxide.

H₂SO₄ + 2 KOH --> K₂SO₄ + 2 H₂O

6. What is the pH of a solution in which [H₃O⁺] = 0.005 M?

pH = -log(0.005) = 2.3

7. What is the [OH^-] in a solution with pH = 5?

[OH^-] = 1 x 10^-9M

8. The concentration of OH^- ions in a certain fruit juice is 1 x 10^-11M. What is the concentration of hydronium ions? What is the pH of the juice?

[OH^-] = 1 x 10^-11M            pOH = 11

[H₃O⁺] = 1 x 10^-3M           pH = 3

Top of Page

Back to Course Homepage

E-mail instructor: Eden Francis

Clackamas Community College
©1998, 2002 Clackamas Community College, Hal Bender