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Question

Molar conductivity of 0.01 M CH3COOH at certain temperature is 38.93 S cm2 mol1. What is its pH?
[λ0H+=349.6 S cm2,λ0CH2COO=78.1 S cm2 mol1 and log 9=0.96]
(Round off to the nearest integer)

A
2.0
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B
2.00
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C
2
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Solution

α=λmλ0m=384.93427.7=0.9
[H+]=Cα=0.009
pH=log[H+]=2.04

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