The degree of ionisation of a weak acid in 0.1 M solution is 0.02. Assuming alpha ll 1, its degree of ionisation in 0.4 M solution at the same temperature is

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The degree of ionisation of a weak acid in $0.1 M$ solution is $0.02$ . Assuming $α ≪ 1$ , its degree of ionisation in $0.4 M$ solution at the same temperature is

Since

α = K_{a} / c

α \propto c^{- 1/2}

. Concentration is four times larger, so

α

is halved:

0.02/2 = 0.01