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Resistance

A 0.01M sol...

Question

A $0.01 M$ solution of acetic acid is $5$ % ionised at $25^{o} C$ . Calculate its dissociation constant.

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Solution

According to ostwald's dilution law
$K_{a} = \frac{C α^{2}}{(1 - α)}$
It is given that $α = 0.05, C = 0.01$
Hence $K_{a} = 2.63 \times 10^{- 5}$ .

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