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Salt of Weak Acid and Strong Base

pKa of CH3COO...

Question

$p K_{a}$ of $C H_{3} C O O H$ is 4.74. The pH of 0.01 M $C H_{3} C O O N a$ is

A

4.74

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B

8.37

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C

9.48

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D

None of these

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Solution

The correct option is B 8.37
Given, $p K_{a} = 4.74$ $[C H_{3} C O O N a] = 0.01 M$
$C H_{3} C O O N a$ is a salt of a weak acid and strong base
$∴ p H = 7 + \frac{1}{2} [p K_{a} + l o g C]$
$p H = 7 + \frac{1}{2} [4.74 + l o g 0.01]$
$p H = 7 + \frac{1}{2} [4.74 - 2] = 8.37$

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Similar questions

Q. Find the change in pH when 0.01 mole

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is added to one litre of 0.01 M

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Q. The ratio of volumes of

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Q. The pH of a solution obtained by mixing 20 ml of 0.02 M

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. The concentration of

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Salt of Weak Acid and Strong Base

Standard XI Chemistry

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