Question

Why for a weak electrolyte its molar conductivity of dilute solution increases sharply as the concentration of solution is decreased?

Answer 1

Answer:

According to Ostwald's dilution law, the degree of dissociation of a weak electrolyte is directly proportional to underroot v or underroot 1/C, where C is the concentration of the electrolyte. Hence, when we decrease the conc. of the weak electrolyte in the solution, its degree of dissociation increases sharply. When the degree of dissociation increases the electrolyte dissociates to give more no. of ions. Now, when the no. of ions increase in a solution, its molar conductivity increases, as ions can carry charge across the solution to conduct electricity.