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Basic Buffer Action

A buffer solu...

Question

A buffer solution contains 0.1 $M$ of acetic acid and 0.1 $M$ of sodium acetate. What will be its $p H$ , if $p K_{a}$ of acetic acid is 4.75 $?$

4.00

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4.75

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5.00

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5.25

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Solution

The correct option is B $4.75$
$p H = p K_{a} + log \frac{[S a l t]}{[A c i d]}$

$p H = 4.75 + log \frac{0.1}{0.1}$

$p H = 4.75 + log 1; p H = 4.75$

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