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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.


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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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