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A buffer solution has equal volume of 0....

A buffer solution has equal volume of 0.20 M `NH_(4)OH` and 0.02 `MNH_(4)Cl :` The `pK_(b)` of the base is 5. The pH is

A

10

B

9

C

4

D

7

Text Solution

Verified by Experts

The correct Answer is:
A
`pOH = pK_(b) + log.(["salt"])/(["base"])`
`= 5 + log.(0.02)/(0.2) = 5 + log.(1)/(10) = 5 + (-1) = 4`
`pH = 14 - pOH = 14 - 4 = 10`.
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