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Concentration Terms

pK a values o...

Question

$p K_{a}$ values of acetic acid is 4.75. If the buffer solution contains $0.125 M$ acetic acid and $0.25 M$ sodium acetate. The $p H$ of buffer solution is:

5.05

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5.5

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4.9

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5.75

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Solution

The correct option is A 5.05
$p H = p K_{a} + log \frac{[Salt]}{[Acid]}$
$= 4.75 + log (\frac{0.25}{0.125}) = 5.05$

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