Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.
Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.

Solution:

Conductivity:

The conductivity of a solution is defined as the conductance of a solution with a length of 1 cm and an area of cross-section of 1 sq. cm and a cross-sectional area of 1 sq. cm. In the physical world, specific conductance is the inverse of resistivity.

Molar conductivity

It is defined as the conductance of volume V of a solution containing 1 mole of electrolyte and maintained between two electrodes with an area cross-section A and a distance equal to the unit length of the solution at a certain concentration.

When the concentration of a substance is reduced, the molar conductivity increases. In this case, it is because dilution raises the total volume V (the total volume V of the solution containing one mole of the electrolyte). The variation is given below: