CBSE Class 12 · 2000 · All India Compartment · Redox Reactions and ElectrochemistryVery Short Answer

At infinite dilution, the molar conductances of Na

^{+}

and SO

_{4}^{2 -}

ions are 50 S cm

^{2}

mol

^{- 1}

and 160 S cm

^{2}

mol

^{- 1}

respectively. What will be the molar conductance of sodium sulphate at infinite dilution?

Answer: 260 S cm² mol⁻¹

Solution

By Kohlrausch's law:

Λ_{m}^{\circ} (N a_{2} S O_{4}) = 2 λ_{N a^{+}}^{\circ} + λ_{S O_{4}^{2 -}}^{\circ}

= 2 \times 50 + 160

= 260 S c m^{2} mo l^{- 1}

CBSE Class 12 Board · 2000 · All India Compartment · Subjective