Lesson 5: Wrap Up
In this lesson you have gotten an introduction to acids and bases. You have learned about the properties of acids and bases, the conceptual approaches that are used to explain the nature of acids and bases, how they are formed, and how they can be recognized or identified either by formula or by lab tests. You have learned about pH and the auto-ionization phenomenon of water. You have also learned to do calculations that relate the concentrations of hydronium ion and hydroxide ion to both pH and the auto-ionization of water.
Be sure to review the objectives for this lesson and take the self quiz to test yourself on how well you understand these topics.
Self Quiz
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.
b. a base.
5. Write a complete balanced equation using the Arrhenius concept for the reaction between sulfuric acid and potassium hydroxide.
6. What is the pH of a solution in which [H3O+] = 0.005 M?
7. What is the [OH-] in a solution with pH = 5?
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?
Self Quiz Answers
1. When HI dissolves in water, which ions are formed?
*b. H3O+ 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
3. Which of the following reactions would indicate a base?
*e. reacts with NH4+ to give NH3
4. An electron pair acceptor is:
*a. an acid. (Lewis definition)
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