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The `pH` of `0.1 M` solution of cyanic acid `(HCNO)` is `2.34`. Calculate the ionization constant of the acid its degree of ionisation in the solution.

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`pH=2.34`
`-log [H_(3)O^(o+)]=2.34`
or `[H_(3)O^(o+)]= Antilog [-2.34]=4.57xx10^(-3)`
For weak acid `[H^(o+)]=Calpha=4.57xx10^(-3)`
`C=0.1`
`:. alpha=(4.57xx10^(-3))/0.1=0.0457`
`K_(a)=Calpha^(2)=0.1xx(0.0457)^(2)=2.09xx10^(-4)`

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