Question

The speed of movement of ions in water follow the order $L{i}^{+}<N{z}^{+}<K^{+}<R{b}^{+}$. Explain the anomaly.

Answer 1

The alkali metals in presence aqueous solution undergo extensive solvation i.e they get surrounded by the solvent molecules.

Smaller the size the more hydrated it will get thus,the order followed is

$L{i}^{+}<N{a}^{+}<K^{+}<R{b}^{+}<C{s}^{+}$