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Question

A solution of 0.1NNH4OH and 0.1NNH4Cl has pH 9.25. Then pKb of NH4OH is

A
9.25
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B
4.75
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C
3.75
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D
8.25
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Solution

The correct option is B 4.75
pOH=pKb+log[salt]Base
[Salt] = [Base]
pOH=pKb
pOH = 14 –pH = 14 – 9.25 = 4.75

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