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The pH of a buffer solution formed by ...

The pH of a buffer solution formed by mixing 30ml of 0.1 M `NH_(4)` OH and 30ml os 1M `NH_(4)` Cl solution is 8.6. The `pK _(b)` of `NH-(4)` OH is

A

5.4

B

4.4

C

5.6

D

4.2

Text Solution

Verified by Experts

The correct Answer is:
B
Given : pH of mixture =8.6
Also `" " Ph = 14 - pOH = 14 - 8.6 =54`
and `" " pOH =n pK _(b) + log ["salt"]/["base"]`
Here `" " ["salt"] =[NH _(4) CL] =1M`
[Base] `=NH_(4)OH] = 0.1M`
`:." " poh = p K _(b) + log (1)/ (0.1) `
`5.4 = pk _(b) + log 10 "implies" 5.4 = pK _(b) + 1`
`:. " " pK _(b) = 5.4 -1 = 4.4 `
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