Question

How does molar conductivity of strong and weak electrolytes vary with concentration?

Answer 1

Weak electrolytes: Weak electrolytes are those electrolytes that do not completely dissociate into their constituent ions.

• When the concentration of a weak electrolyte becomes very low by the dilution of a weak electrolyte, the degree of ionization of a weak electrolyte rises sharply.
• Due to an increase in the degree of ionization, the number of ions in the solution increases.
• Hence, the molar conductivity of a weak electrolyte rises as the concentration of solution decreases.

Strong electrolytes: Strong electrolytes are those electrolytes that completely dissociate into their constituent ions.

• The molar conductivity of a strong electrolyte increases with the increase in concentration because as the concentration of the electrolyte increase, the number of ions in the solution increases.

Variation of conductance with variation in concentration: