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
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a
9.30
b
7.30
c
10.30
d
8.30
answer is A.
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Detailed Solution
As [salt ]=[ acid ] ;2.5 moles each PH=PKa+ log[salt][acid] log[salt][acid]=0pH=pKa=9.30