CBSE Class 12 Chemistry 2017 Delhi Set 1 Solved Paper

Question : 9

Total: 26

Calculate the degree of dissociation (α) of acetic acid if its molar conductivity (Λm) is 39.05S‌cm mol−1.
Given λ∘(H+)=349.6Scm2mol−1 and λ∘(CH3COO−) =40.9Scm2mol−1.

Solution:

Λ°CH3‌COOH=λ°CH3COO−+λ°H+
‌=40.9+349.6
‌=390.5Scm2∕mol
N,‌‌α‌=Λm∕Λ°m
‌=39.05∕390.5=0.1

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