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The pKa of HCN is 9.30. The pH of a sol...

The pKa of HCN 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 :

A

`9.30`

B

`7.30`

C

`10.30`

D

`8.30`

Text Solution

Verified by Experts

The correct Answer is:
A
`pH=pK_(a)+"log"(["Salt"])/(["Acid"])`
`pH=9.30+"log"((2.50))/((2.50))`
`= 9.30`.
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