Question #180ac

1 Answer
Oct 23, 2017

Cs^+ will have higher conductivity than Li^+ in solution.

Explanation:

Lithium as well as caesium are both Group-1 elements.

Here, both Li^+ as well as Cs^+ have equal charges. But, the ionic size of the later is much more than that of the former.

Hence, the charge to size ratio of Li^+ is higher than that of Cs^+.

Now, higher the charge to size ratio of a cation, higher will be it's hydration enthalpy.

So, Li^+ will get immensely hydrated than that of negligible hydration of Cs^+.

Therefore, the hydrated Li^+ ion will be of much larger size than that of negligible hydrated Cs^+ ion in solution.

Hence, the mobility of Cs^+ ion will be much higher than that of Li^+ ion.

This means, that the Cs^+ ion will have higher conductivity than that of Li^+ ion in solution.

Hope it Helps:)