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Components of buffer solution are 0.1 M ...

Components of buffer solution are 0.1 M HCN and 0.2 M NaCN. What is the pH of the solution

A

`9.61`

B

`6.15`

C

`2.0`

D

`4.2`

Text Solution

Verified by Experts

The correct Answer is:
A
`pH = pK_(a) +log. [("Salt")/("acid")]`
` = 9.30 + log [(0.2)/(0.1)] = 9.30 + 0.3010 = 9.6 `
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