1.

The pH of 2.5xx10^(-1) M HCN solution (K_(a)=4xx10^(-10)) is :

Answer»

`2xx10^(-5)`
`2.0`
`4.7`
`5.0`

Solution :`[H_(3)O^(+)]=sqrt(K_(a)xx C)`
`= sqrt(4xx10^(-10)xx2.5xx10^(-1))`
`=sqrt(1xx10^(-10))=1xx10^(-5)`
`therefore PH =-log(10^(-5))=5`


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