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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"])/(["acid"])`
`= 4.2 + "log"1` (because`["salt"] = ["base"]`)
`= 4.2`
`pH = 14 - pOH = 14-42 = 9.8`
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