First slide

Acidic buffer

Question

For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be $(K_{a} = 10^{- 5})$

Moderate

A

1 : 10
B

10 : 1
C

100 : 1
D

1 : 100

Solution

$K_{a} = 10^{- 5}; pH = 6$
$pH = - \log K_{a} + \log \frac{[Salt]}{[Acid]} 6 = - \log 10^{- 5} + \log \frac{[Salt]}{[Acid]} 6 = 5 \log 10 + \log \frac{[Salt]}{[Acid]}; 6 = 5 + \log \frac{[Salt]}{[Acid]} \log \frac{[Salt]}{[Acid]} = 6 - 5 = 1; \frac{[Salt]}{[Acid]} = \frac{10}{1}$

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