7. 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
.
Balanced equation:
C
5
H
5
N (aq) + H
2
O (l)
HC
5
H
5
N
+
(aq) + OH
-
(aq)
I.C.E. table:
C
5
H
5
N (aq)
HC
5
H
5
N
+
(aq)
OH
-
(aq)
INITIAL
0.050M
0M
0M
CHANGE
-xM
+xM
+xM
EQUILIBRIUM
What are the equilibrium concentrations of each species?
a) xM, (0.050-x)M, xM
b) (0.050-x)M, xM, xM
c) xM, xM, xM
d) (0.050-x)M, (0.050+x)M, xM
