Question

pka of hydroiyanic acid hcn is 9.31 what would be the hydrogenion concentration is 0.0 2 m solution of it
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Answer 1

Explanation:

mixture of HCN and KCN is an acidic buffer.

The expression for the pH of the acidic buffer solution is as given below:

pH=pK

a

+log

[acid]

[salt]

pK

a

=9.3

Substituting values in the above equation, we get

pH=9.3+log

2.5

0.25

=8.3.

Option D is correct.