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What is the pH of solution obtained by m...

What is the pH of solution obtained by mixing `100 mL` of each `0.2 M NH_(4)Cl` and `0.2M NH_(4)OH`, if `pK_(b)` of `NH_(4)OH` is `4.2`?

A

9.8

B

4.2

C

`7.0`

D

8.4

Text Solution

Verified by Experts

The correct Answer is:
A
`pOH=pK_(b)=log""(["salt"])/(["base"])`
`=4.2+log1` (because [salt]=[base]=4.2
`pH=14-pOH=14-4.2=9.8`
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