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The simplest explanation is that the smaller ion has a greater charge density which results in stronger hydration and a larger hydrated radius. The surrounding polarized solvent molecules and the positive ion mutually attract thereby increasing drag or resistance to motion of the ion.


You simply started your data range at too high a concentration to see the initial increase. Semantic Scholar gives data for the conductivities of several aqueous electrolyte solutions at 25°C, including magnesium chloride. The strongly increasing portion of the magnesium chloride curve goes up to about 10%, which corresponds to about one molar (where your ...

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