The $p K_{a}^{o} s$ of formic acid, hydrofluoric acid, acetic acid and hydrazoic acid are 3.74, 3.17, 4.74 and4.72, respectively, which of the following acid will have largest degree of dissociation?

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0.1 M Hydrazoic acid

0.1 M Hydrofluoric acid

0.1 M Formic acid

0.1 M Acetic acid

answer is B.

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Detailed Solution

The degree of dissociation is $α = \sqrt{K_{a} / c}$ . For equimolar solution of acid, the larger the value of $K_{a}$ , larger the degree of dissociation. Larger the value of $K_{a}$ implies minimum value of $p K_{a}^{o}$ .

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