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Kohlrausch's law allows the calculation of limiting molar conductivity of a weak electrolyte by
Aaveraging the strong-electrolyte values (typical)
Bextrapolating κ to zero concentration
Cadding limiting molar conductivities of constituent ions
Dmeasuring at infinite temperature
Answer & Solution
Correct answer: C. adding limiting molar conductivities of constituent ions
1. Direct extrapolation of Λ_m to infinite dilution fails for weak electrolytes.
2. Kohlrausch: Λ°_m = ν₊ λ°₊ + ν₋ λ°₋ , i.e. the sum of individual limiting ion conductivities.
3. Using strong-electrolyte data for the ions, the weak electrolyte's Λ°_m can be obtained indirectly.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 5 "Electrochemistry" §5.10_
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