1.

The pKa ofHCN is 9.30. The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up the total volume of 500 ml is :

Answer»

`9.30`
`7.30`
`10.30`
`8.30`

SOLUTION :`pH=pK_(a)+"LOG"(["SALT"])/(["ACID"])`
`pH=9.30+"log"((2.50))/((2.50))`
`= 9.30`.


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