Question

what is hydration enthalpy and how does it depend upon size?

Answer 1

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>>>>>>>>>>>>>>If the hydration enthalpy is equal to or greater than the lattice enthalpy, then the salt is water soluble. Factors on whichHydration enthalpy depends : 1)size of cations and anions : As the atomic numbers increases, ionic size also increases, leading to a decrease in absolute values of enthalpy of hydration.

Answer 2

The size of the hydration enthalpy is governed by the amount of attraction between the ions and the water molecules. The attractions are stronger the smaller the ion. For example, hydration enthalpies fall as you go down a group in the Periodic Table.