First slide

Salt hydrolysis :

Question

When 10 ml of 0.1 M acetic acid $(p K_{a} = 5.0)$ is titrated against 10 ml of 0.1 M ammonia solution $(p K_{b} = 5.0)$ , the equivalence point occurs at pH

Moderate

A

5.0
B

6.0
C

7.0
D

9.0

Solution

For salt of weak acid and weak base,
$pH = \frac{1}{2} [P^{K_{w}} + P^{K_{a}} - P^{K_{b}}]$
$= \frac{1}{2} [14 + 5 - 5] = 7$

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