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Salt of Weak Acid and Strong Base

The pH of a...

Question

The $p H$ of a solution which is $0.1 M$ sodium acetate and $0.01 M$ acetic acid $(p K_{a} = 4.74)$ would be:

4.2

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5.1

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5.74

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None of these

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Solution

The correct option is A $5.74$
This is an acidic buffer solution.

$p H = p K_{a} + l o g \frac{[C H_{3} C O O N a]}{[C H_{3} C O O H]}$

$p H = 4.74 + l o g \frac{0.1}{0.01}$

$p H = 4.74 + 1$

$p H = 5.74$

Hence, the pH of the buffer solution is $5.74$ .

Option C is correct.

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