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Explain Kohlrausch's law and application of Kohlrausch's law
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Answer 1

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Answer 2

1) Kohlrausch law states that, “At time infinite dilution, the molar conductivity of an electrolyte can be expressed as the sum of the contributions from its individual ions” i.e. Λ∞m = v+ λ∞+ + v- λ∞-, where, v+ and V- are the number of cations and anions per formula unit of electrolyte respectively and, λ∞+ and λ∞- are the molar conductivities of the cation and anion at infinite dilution respectively.
2) Applications of Kohlrausch's law-
(i) Determination of Λ∞m for weak electrolytes: The molar conductivity of a weak electrolyte at infinite dilution (Λ∞m) cannot be determined by extrapolation method. However, Λ∞m values for weak electrolytes can be determined by using the Kohlrausch's equation.

Λ∞CH3 COOH = Λ∞CH3COONa + Λ∞CHI - Λ∞NaCI

(ii) Determination of the degree of ionization of a weak electrolyte: The Kohlrausch's law can be used for determining the degree of ionization of a weak electrolyte at any concentration.