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Question

Solutions of0.1 N NH4OH and 0.1N NH4Cl 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+logSaltBase

[Salt]=[Base]POH=PKb

POH=14PH=149.25=4.75


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