K(a) for HCN is 5 xx 10^(-10) at 25^(@)C...

`K_(a)` for `HCN` is `5 xx 10^(-10)` at `25^(@)C`. For maintaining a constant `pH` of `9.0`, the volume of `5M KCN` solution required to be added to `10mL` of `2M HCN` solution is

`4mL`

`8mL`

`2mL`

`10mL`

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