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Salt of Weak Acid and Strong Base

The pH of a s...

Question

The pH of a solution which is $0.1 M$ sodium acetate and $0.01 M$ acetic acid $(p K_{a} = 4.74)$ would be:
(Write the value to the nearest integer)

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Solution

The given solution is an acidic buffer solution.

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

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

$= 4.74 + 1 = 5.74$

Hence, the pH of the buffer solution is $5.74$ .
Nearest integer is 6.

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