Chemistry 152 Chemistry Worksheet With Answers Page 3
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8Always try the assumption. In this case x<<0.13
↔
-
+
HCHO
(aq)
+ H
O (l)
CHO
(aq)
+ H
O
(aq)
2
2
2
3
I
0.13 M
-
0.11
0
C
-
-
+
+
E
0.1298
-
0.1102
It’s just LeChatelier’s principle. If I put a bunch of product (formate ion) into the mix, I shift
the equilibrium back towards the reactants which decreases the amount of acid that
dissociates.
16.14 Use the Henderson-Hasselbalch equation to calculate the pH of a solution that is
a. 0.155 M in propanioc acid and 0.110 M in potassium propanoate
b. 0.15 M in C
H
N and 0.10 M in C
H
NHCl
5
5
5
5
c. 15.0 g of HF and 25.0 g of NaF in 125 mL of solution
SOLUTION:
a.
b.
c.
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