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Molarity

What would be...

Question

What would be the ionisation constant $(K_{a})$ of $C H_{3} C O O H$ ?

2 \times 10^{- 5}

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10^{- 5}

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2 \times 10^{- 6}

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5 \times 10^{- 6}

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Solution

The correct option is B $10^{- 5}$
$C H_{3} C O O H + N a O H ⇌ C H_{3} C O O N a + H_{2} O$
$150500$
$p H = p k_{a} + l o g \frac{[s a l t]}{[a c i d]}$ (Since acidic buffer)
$4.7 = p k_{a} + l o g \frac{50 \times 0.1}{100 \times 0.1}$
$p K_{a} = 5, k_{a} = 10^{- 5}$ .

Suggest Corrections

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K_{a} f o r C H_{3} C O O H a t 25^{o} C i s 1.754 \times 10^{- 5} .

△ S^{o}

J / m o l K

C H_{3} C O O H

△ H^{o}

1.55 k J / m o l

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