Chemistry - Electrochemistry Question with Solution | TestHub

According to Kohlrausch's law of independent migration of ions, the limiting molar conductivity of an electrolyte is the sum of the limiting ionic conductivities of the cation and the anion, each multiplied by the number of ions present in one formula unit of the electrolyte.

The dissociation of sodium sulphate is given by:

${\text{Na}}_2{\text{SO}}_4\to 2{\text{Na}}^{+}+{\text{SO}}_4^{2-}$

Thus, the molar conductivity at infinite dilution is:

${\Lambda }_0({\text{Na}}_2{\text{SO}}_4)=2{\lambda }^0({\text{Na}}^{+})+{\lambda }^0({\text{SO}}_4^{2-})$

Answer: ${\Lambda }_0({\text{Na}}_2{\text{SO}}_4)=2{\lambda }_{({\text{Na}}^{+})}^0+{\lambda }^0({\text{SO}}_4^{2-})$