PRELABORATORY QUESTIONS

References: Brown, Lemay, and Bursten, Chemistry the Central Science, 8th ed. (2000),
pp. 112-113 (ionic equations);
p. 127 (molarity); p. 130 (dilution);
pp. 641-650 (common ion effect, buffers, Henderson-Hellelbalch equation).

Learning Center: SSM Lesson 6 (pp. 72-73, 75-77) (dilution).
SSM Lesson 21 (pp. 281-285) (buffers)
Writing NIE (study guides);answers to pre- and post-lab questions.

Pre-laboratory Questions

SHOW SET-UP AND WORK FOR ALL PROBLEMS

A mixture of 4.07 mL 0.200 M gallic acid and 13.62 mL 0.150 sodium gallate is prepared.
(Gallic acid is a mono-protic acid.)

1. What is the concentration of gallic acid in the mixture?

2. What is the concentration of sodium gallate in the mixture?

3. If the pH of the mixture is 4.81, what is K_a for gallic acid?