Question

With the help of a graph explain why it is not possible to determine Λ°m for a weak electrolyte by extrapolating the molar conductivity (Λm) versus C^(1/2) curve as for strong electrolyte.

The molar conductivities of NH₄⁺ and Cl⁻ ion are 73·8 S cm² mol⁻¹ and 76·2 S cm² mol⁻¹ respectively. The conductivity of 0·1 M NH₄Cl is 1·29 × 10⁻² S cm⁻¹. Calculate its molar conductivity and degree of dissociation.

Calculate the half-cell potential at 298 K for the reaction : Zn²⁺ + 2e⁻ → Zn if [Zn²⁺] = 0·1 M and E°(Zn²⁺/Zn) = –0·76 V.

The molar conductivity of 0.025 mol L⁻¹ methanoic acid is 46.1 S cm² mol⁻¹. Calculate its degree of dissociation and dissociation constant. Given λ°(H⁺) = 349.6 S cm² mol⁻¹ and λ°(HCOO⁻) = 54.6 S cm² mol⁻¹.

State Kohlrausch's law of independent migration of ions. Write an expression for the limiting molar conductivity of acetic acid according to Kohlrausch's law.