Kohlrausch's law of independent migration of ions is used to compute
A{'text': 'Standard electrode potentials of half-reactions', 'label': 'A'}
B{'text': 'Limiting molar conductivity of weak electrolytes', 'label': 'B'}
C{'text': 'Overall rate of a chemical reaction in solution', 'label': 'C'}
D{'text': 'Activation energy of the dissolution process', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Limiting molar conductivity of weak electrolytes', 'label': 'B'}
1. Kohlrausch law: at infinite dilution, each ion contributes independently to conductance.
2. Limiting molar conductivity Λ°_m of a salt equals the sum of cation and anion contributions.
3. For weak electrolytes where direct extrapolation is not possible, we use strong-electrolyte values.
4. Example: Λ°_m(CH₃COOH) = Λ°_m(CH₃COONa) + Λ°_m(HCl) − Λ°_m(NaCl).
_Source: NCERT Class 12 Chemistry, Unit 3 "Electrochemistry", §3.5_
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