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The textbook says,

The smaller the effective size of the ion after solvation, the greater will be its conducting power."

But, on the Internet, it is explained as follows:

Radius decreases, smaller ions carrying current in small area, more associations with anions & due to this, the ions become heavy & they move with reduced speed as compared to less associated ones, & thus conductivity decreases.

The explanation is different to the what the book says. Could someone please explain this?

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The thing can be explained as: whenever a small sized ion(particularly it's actual ionic size but not after solvation) is solvated it's effective radius increases and hence due to the increased size of the ion the space required for each ion is now lesser than what it had earlier. Hence, it can be said so conducting power changes inversely with the effective radius after solvation( as more solvated ion conducts less as compared to the less solvated).

And according to your writing both the references are correct as internet said about "conductivity and not about conducting power". So don't get confused between them.

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