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The equivalent conductances of two strong electrolytes at infinite dilution in H 2 O (where ions move freely through a solution) at 25 ℃ are given below : Λ CH 3 COONa o = 91.0 S cm 2 / equivalent Λ HCl o = 426.2 S cm 2 / equivalent . What additional information/quantity one needs to calculate Λ o of an aqueous solution of acetic acid?

Options

  1. AΛ o of chloroacetic acid ClCH 2 COOH
  2. BΛ o of NaCl
  3. CΛ o of CH 3 COOK
  4. DThe limiting equivalent conductance of H + λ H + o

Correct answer

B. Λ o of NaCl

Step-by-step solution

According to Kohlrausch's law, the molar conductivity at infinite dilution Λ o for weak electrolyte, CH 3 COOH is Λ CH 3 COOH o = Λ CH 3 COONa o + Λ HCl o - Λ NaCl o So, for calculating the value of Λ CH 3 COOH o , value of Λ NaCl o should also be known.

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