3. Calculate the pH of a 0.050M solution of the weak base pyridine (
C
5
H
5
N
) if it has
K
b
= 1.7
x
10
-4
.
First we need a balanced equation:
a)
C
5
H
5
N (aq)
C
5
H
4
N
-
(aq) + H
+
(aq)
b)
C
5
H
5
N (aq) + H
2
O (l)
HC
5
H
5
N
+
(aq) + OH
-
(aq)
c)
C
5
H
5
N (aq) + OH
-
(aq)
C
5
H
4
N
-
(aq) + H
2
O (l)
d)
C
5
H
5
N (aq) + H
2
O (l)
C
5
H
5
NOH
-
(aq) + H
+
(aq)
