a
b
1.
Determine the K a
of a weak acid if a 0.300 M solution has a pH of 1.94.
2.
What is K b
for N
2
H
4
(hydrazine) if a 0.500 M solution has the following concentrations at equilibrium? [N
2
H
4
] = 0.499 M, [OH ] = 1.23 x 10 -3 M, [N
2
H
5
+ ] =
1.23 x 10 -3
3.
A solution of 1.00 M HA in water ionizes 2.00 %. Find K a
.
4.
A 0.250 M solution of a weak acid is 1.75 % ionized. Determine the pH and K a
of this solution.
5.
What is more acidic, a solution 0.100 M boric acid or a 0.100 M solution of nitrous acid? (see data booklet)
6.
C
5
H
5
N is a weak base. A 0.125M solution of this base has a pH of 9.10. Find the
K b
.
7.
Benzoic acid (C
6
H
5
COOH) is a weak acid. If K a
of benzoic acid is 6.46 x 10 -5 then find: a) the pH of a 0.0125 M solutionb) the % ionization of this solution
8.
What is the percent ionization in 0.0200 M HClO? K a
= 3.16 x 10 -8
9.
What is the ethanoate ion concentration in a 0.0178 M solution of ethanoic acid?
10.
What would be the hydrogen ion concentration in a 0.884 M solution of hydrocyanic acid?
11.
The ionization constant of a weak acid is 5.50 x 10 -5 . Find the percent ionization of a 0.0150M solution of the acid.
12.
Ammonia, NH
3
, is a weak base. Find the pH of a 0.150M solution of this base.