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Question

What is the value of pKb(CH3COO) if λm=390 & λm=7.8 for 0.04 M CH3COOH at 25oC?

A
9.3
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B
9.2
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C
4.7
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D
4.8
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Solution

The correct option is B 9.2
As, dissociation factor
α=λmλm=7.8390=0.02
Ka(CH3COOH)=Cα2=0.4×(0.02)2=(2)4×106
pKa=6log24=64×0.3=4.8
pKb(CH3COO)=14pka=9.2

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