Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration?

Answer:

The molar conductivity of a solution at infinite dilution is known as limiting molar conductivity. In other words, When the concentration of the electrolyte approaches zero, the molar conductivity is known as limiting molar conductivity.

With reduced concentration, conductivity decreases as the number of ions per unit volume that hold the current in a solution decrease with dilution whereas the molar conductivity of a solution increases with the decrease in concentration. This increase in molar conductivity is because of the increase in the total volume containing one mole of the electrolyte.

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