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Question

What is the value of pKb(CH3COO)ifλm=390andλm=7.8 for 0.04 M of a CH3COOH solution at 25C?

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
α=λmλm=7.8390=0.02

Ka(CH3COOH)=Cα2=0.04×4×104=16×106

pKa=4.8

pKa+pKb=14

so pKb=9.2

Hence, option B is correct.

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