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Q.

The pKa of HCN is 9.30 at 25°C. The pH of an aqueous solution which has 2.5 moles of KCN and 2.5 moles of HCN in 500 mL at same temperature is (make your answer to nearest integer)

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answer is 9.

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Detailed Solution

As [Salt]=[Acid]
∴pH=pKa=9.30

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