Chemistry 152 Chemistry Worksheet With Answers
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8Chapter 16: 4, 6, 14, 22, 42, 52, 56, 60, 66
16.4 Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution:
a. A solution that is 0.175 M in HC
H
O
and 0.110 M in KC
H
O
2
3
2
2
3
2
b. A solution that is 0.195 M in CH
NH
and 0.105 M in CH
NH
Br
3
2
3
3
SOLUTION:
a.
O (l) ↔ C
-
+
HC
H
O
(aq) + H
H
O
(aq) + H
O
(aq)
2
3
2
2
2
3
3
↔
-
+
HC
H
O
(aq)
+ H
O (l)
C
H
O
(aq)
+ H
O
(aq)
2
3
2
2
2
3
3
I
0.175 M
-
0.110 M
0
C
-x
-
+x
+x
E
0.175-x
-
0.110+x
x
Always try the assumption. In this case x<<0.110
, good assumption
b.
O (l) ↔ CH
+
-
CH
NH
(aq)+ H
NH
(aq)+ OH
(aq)
3
2
2
3
3
↔
+
-
CH
NH
(aq)
+ H
O (l)
CH
NH
(aq)
+ OH
(aq)
3
2
2
3
3
I
0.195 M
-
0.105 M
0
C
-x
-
+x
+x
E
0.195-x
-
0.105+x
x
Always try the assumption. In this case x<<0.105
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