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Basic Buffer Action

The pH of sol...

Question

The pH of solution containing $0.10 M$ sodium acetate and $0.03 M$ acetic acid is: ( $p K_{a}$ for ${C H}_{3} C O O H = 4.57$ )

4.09

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6.09

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7.09

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5.09

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Solution

The correct option is D 5.09
According to Henderson equation $p H$ of acidic buffer is:

$p H = p K_{a} + log \frac{S a l t}{A c i d}$

$= 4.57 + log \frac{0.10}{0.03}$

$= 4.57 + [log 10 - log 3]$

$= 4.57 + log 3.33$

$= 4.57 + 0.52 = 5.09$

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