First slide

Acidic buffer

Question

Calculate pH of a solution of given mixture (0.1 mole ${CH}_{3} COOH + 0.2 mole {CH}_{3} COONa)$ in 100 ml of mixture. $K = 2 \times 10^{- 5} .$

Moderate

A

5.0
B

5.6
C

6.6
D

7.6

Solution

We have
$P^{H} = - \log K_{a} + \log \frac{[Salt]}{[Acid]} = - \log (2 \times 10^{- 5}) + \log (0.2 / 0.1) = 4.6990 + 0.3010 = 5$

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