The `pK_(a)` of `HCN` is 9.30. The pH of a solutin prepared by mixing `2.5` moles of `KCN` and `2.5` moles of `HCN` in water and making up the total volume to `500 mL` is

Options

A. 9.3
B. 7.3
C. 10.3
D. 8.3

Answer

A