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Introduction to Nucleophilic Substitution Reaction

The pH of a b...

Question

The pH of a buffer solution prepared by mixing $50 m l$ of $0.2 M$ $C H_{3} C O O H$ and $25 m l$ of $C H_{3} C O O N a$ is $4.8$ . What is the concentration of $C H_{3} C O O N a$ ? $[p K a$ of $C H_{3} C O O H = 4.8]$

0.2M

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0.4M

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0.5M

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0.8M

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Solution

The correct option is A 0.4M
$p H = p K_{a} + l o g (\frac{V \times [C H_{3} C O O N a]}{V \times [C H_{3} C O O H]})$

Substituting values in the above expression, we get,

$4.8 = 4.8 + l o g (\frac{25 \times [C H_{3} C O O N a]}{50 \times 0.2})$

$[C H_{3} C O O N a] = 0.4 M$

Option B is correct.

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