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Amines as Bases

When a soluti...

Question

When a solution of benzoic acid was titrated with NaOH the pH of the solution when half the acid neutralized was 4.2. Dissociation constant of the acid is

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Solution

The correct option is A
$C_{6} H_{5} C O O H + N a O H ⇌ C_{6} H_{5} C O O N a + H_{2} O$ 0.5 0.5
After neutralization it is a butter solution of weak acid and its salt.
$p H = p K_{a} + l o g \frac{[S a l t]}{[a c i d]}$
$p K_{a} = 4.2$
$K_{a} = 6.31 \times 10^{- 5}$

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