Question

Molar conductance of BaCl2, H2SO4,and HCl at infinite dilutions are 200, 300 and 50 respectively. Equivalent conductance of 50 at infinite dilution is

Answer 1

Answer: The equivalent conductance of $BaSO_4$ at infinite dilution is $400Scm^2$

Explanation:

To calculate the equivalent conductance of $BaSO_4$ at infinite dilution, we will apply Kohlrausch Law.

This law states that the sum of the limiting ionic conductivities of the cation and the anion each multiplied with the number of ions that are present in one formula unit of the electrolyte.

The equation used to calculate the equivalent conductance of $BaSO_4$ at infinite dilution is:

$\Lambda^o_{BaSO_4}=\Lambda^o_{BaCl_2}+\Lambda^o_{H_2SO_4}-2\Lambda^o_{HCl}$

We are given:

$\Lambda^o_{BaCl_2}=200Scm^2\\\Lambda^o_{H_2SO_4}=300Scm^2\\\Lambda^o_{HCl}=50Scm^2$

Putting values in above equation, we get:

$\Lambda^o_{BaSO_4}=[200+300-(2\times 50)]\\\\\Lambda^o_{BaSO_4}=400Scm^2$

Hence, the equivalent conductance of $BaSO_4$ at infinite dilution is $400Scm^2$