First slide

Acidic buffer

Question

The ${pK}_{a}$ of HCN is 9.30. The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up the total volume of 500 mL is

Moderate

A

9.30
B

7.30
C

10.30
D

8.30

Solution

$As [salt] = [acid]; 2.5 moles each P^{H} = P^{Ka} + \log \frac{[salt]}{[acid]} \log \frac{[salt]}{[acid]} = 0$
$pH = {pK}_{a} = 9.30$

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