Why does the conductivity of a solution decrease with dilution ?
On dilution the volume of the solution is increasing but the number of ions that carry charge in a solution remains the same. Hence the number of ions per unit volume that carry charge in a solution decreases. Conductivity through a solution is due to these ions that are present in it. Pure water is not very conductive at all, but salty water is quite conductive. Therefore the more salt or ions dissolved in solution, the higher the conductivity (within limits). As you dilute in solution the concentration of ions goes down, and the ability to pass a current is diminished.
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- Conductance of Electrolytic Solutions - Variation of Conductivity and Molar Conductivity with Concentration