Question

 At 298 K, the limited molar conductivities at infinite dilution of sodium benzoate, hydrochloric acid and sodium chloride are 8.24 × 10⁻³ S m² mol⁻¹, 4.26 × 10⁻² S m² mol⁻¹ and 1.26 × 10⁻² S m² mol⁻¹, respectively. Calculate the limiting molar conductivity of aqueous benzoic acid. 

22 Aug 2025
Answer :
Word Count : 498
Electrolyte conductance at infinite dilution is governed by Kohlrausch’s law of independent ionic migration, which states that the limiting molar conductivity (Λ°) of an electrolyte equals the sum of the individual contributions of its constituent ions, each contribution depending only on the ion and the solvent at a given temperature. Practically, this lets us build the Λ° of a target electrolyte by combining tabulated Λ° values of other electrolytes that share the same ions and then cancelling spectator ions algebraically. For weak electrolytes such as benzoic acid, direct extrapolation to infinite dilution from conductance measurements is difficult because dissociation _________ ___ ______ ______ _______ ____ ______ ________.
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