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Basic Buffer Action

Suppose it is...

Question

Suppose it is required to make a buffer solution of $p H = 4$ , using acetic acid and sodium acetate. How much of sodium acetate is to be added to $1$ litre of $N / 10$ acetic acid?
Dissociation constant of acetic acid $1.8 \times 10^{- 5}$

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Solution

Applying Henderson's equation
$p H = log \frac{[S a l t]}{[A c i d]} - log K_{a}$
$4 = log [S a l t] - log (0.1) - log 1.8 \times 10^{- 5}$
so, $log [S a l t] = 2.2552$
$[S a l t] = 0.018 g m o l L^{- 1}$
The molecular mass of ${C H}_{3} C O O N a = 82$
Amount of salt $0.018 \times 82 = 1.476 g$

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