Question

How does molar conductivity vary with increase in concentration for strong and weak electrolyte ? How can you obtain liming molar conductivity $(\mathit{\Delta}m^{0} )$

Answer 1

Answer:

For strong electrolytes the molar conductivity is increased only slightly on dilution. A strong electrolyte is completely dissociated in solution thus, furnishes all ions for conductance.

However, at higher concentration dissociated ions are close to each other and the interionic contractions are greater. These forces return the motion of the ions and thus conductivity is low. With decrease in concentrations, the hands move away from each other thereby feeling less attractive forces from the counter ions.

This results in an increase in molar conductivity with dilution. The molar conductivity approaches a maximum limiting value at infinite dilution designated as $(\mathit{\Delta}m^{0} )$