Harris Quantitative Analysis, Quantitative Analysis

1. Which one of the following weak acids would be
the strongest in water
a. NH4
+
Kb = 1.75 x 10-5
b. HNO2 Kb = 1.4 x 10-11
c. HOCl Kb = 3.3 x 10-7
What is the conjugate base for HCO3
-
a. H2CO3
b. CO3
-2
c. H3CO3
d. CO
Does KHCO3 give rise to
(a) An acidic solution when dissolved in water
(b) A basic solution when dissolved in water
(c) Both, its an amphoteric salt
(d) Not enough information is given

2. What is the pH of 0.050 M HCl?
What is the pH of a 0.10 M NaF solution

3. What is the pH of 0.050 M acetic acid?

4. What is the pH of 0.10 M HOCl given a Ka of 3.0 x 10-8
?
Additional problems:

5. What is the pH of a solution prepared by mixing 100.0 mL of 0.200 M
sodium acetate with 200.0 mL of 0.150 M acetic acid. The Ka for acetic
acid is 1.75 x 10-5

6. Calculate the pH of a solution that is 0.0100 M HClO4 and 0.0300 M
ClCH2COOH (Ka = 1.36 x 10-3
)
Additional problems:

7. What is the pH of a 0.100 M solution of sodium acetate. The pKa for acetic
acid is 4.75)