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Ka for HCN is 5 xx 10^-10 at 25^@C. For ...

`K_a` for HCN is `5 xx 10^-10` at `25^@C`. For maintaining a constant pH of 9. Find the volume of 5 M KCN solution required to be added to 10 mL of 2 M HCN solution.

A

4 ml

B

7.95 ml

C

2 ml

D

9.3 ml

Text Solution

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The correct Answer is:
C
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