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Q.

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 to a volume of 500 mL is

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a

10.30

b

8.30

c

9.30

d

7.30

answer is A.

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Detailed Solution

PKa=9.3 ;PH=pKa=9.3

Because PKa=-PH+log10saltacid

[salt] = 2.5[KCN] 

[Acid] = 2.5[HCN]

∴ PKa=PH=9.3

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