First slide

Acidic buffer

Question

P^Kaof acetic acid is 4.74. The concentration of CH₃COONa is 0.01M. The pH of CH₃COONa solution is

Moderate

A

10.37
B

8.37
C

7.0
D

4.37

Solution

P^H of a salt of weak acid and strong base is given as $P^{H} = \frac{1}{2} [P^{K_{w}} + P^{K_{a}} + {logC}_{0}]$
$\Rightarrow P^{H} = \frac{1}{2} [14 + 4.74 - 2] = 8.37$

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