Conductivity changes with the concentration of the electrolyte. On dilution as volume of solution increases. Thus, the number of ions per ml decreases and hence conductivity decreases. ... Thus on dilution, ions get more apart and mobility of ions increases which leads to increase in molar conductivity of the solution.

Why does conductivity decrease in dilution?

Conductivity of a solution is the conductance of ions present in a unit volume of the solution. ... On dilution the number of ions per unit volume decreases. Hence, the conductivity decreases.

Why does conductivity of a solution increase with dilution?

Even after dilution, we are still considering the same unit mole of ions. But however, the increased dilution results in the dissociation of more electrolytes into ions and effectively increasing the number of active ions in the solution. These active ions impart more conductivity.