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Question

Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. 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
We know the relation,
pH+pOH=14     (at 25oC)
9.25+pOH=14
pOH=149.25
pOH=4.75  .....(1)
Using the Henderson-Hasselbalch equation for weak bases:
pOH=pKb+log[[conjugate acid][base]]
pOH=pKb+log (1)
pOH=pKb   (log 1=0)
pKb=4.75           (from equation 1)
Hence pKb value is 4.75

Chemistry

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