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Basic Buffer Action

The hydrogen ...

Question

The hydrogen ion concentration of a buffer solution consisting of a weak acid and its sodium salt is given by:

[H^{+}] = K_{a} \frac{[A c i d]}{[S a l t]}

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[H^{+}] = K_{a} [S a l t]

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[H^{+}] = K_{a} [A c i d]

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[H^{+}] = K_{a} \frac{[S a l t]}{[A c i d]}

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Solution

The correct option is A $[H^{+}] = K_{a} \frac{[A c i d]}{[S a l t]}$
Using Henderson's equation,
$p H = log \frac{[S a l t]}{[A c i d]} + p K_{a}$
$- log [H^{+}] = log \frac{[S a l t]}{[A c i d]} - log K_{a}$
${[H]}^{+} = K_{a} \frac{[A c i d]}{[S a l t]}$

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