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Acidic Buffer Action

A buffer solu...

Question

A buffer solution of $p H = 5.74$ is to be prepared using $C H_{3} C O O H$ and $C H_{3} C O O N a$ . Find the concentration of sodium acetate to be added to $0.01 M$ solution of $C H_{3} C O O H$
$K_{a} (C H_{3} C O O H) = 1.8 \times 10^{- 5}$
Take $l o g (1.8) = 0.26$

A

0.1 M

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B

0.5 M

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C

1 M

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D

1.5 M

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Solution

The correct option is A 0.1 M
$p K_{a} = - l o g (K_{a}) p K_{a} = - l o g (1.8 \times 10^{- 5}) = (5 - 0.26) p K_{a} = 4.74$
$p H = p K_{a} + l o g \frac{[s a l t]}{[a c i d]} p H = p K_{a} + l o g (\frac{[C H_{3} C O O N a]}{[C H_{3} C O O H]}) 5.74 = 4.74 + l o g \frac{[C H_{3} C O O N a]}{0.01} 1 = l o g \frac{[C H_{3} C O O N a]}{0.01} 10^{1} = \frac{[C H_{3} C O O N a]}{0.01} [C H_{3} C O O N a] = 0.1 M$

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Acidic Buffer Action

Standard XIII Chemistry

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