What is the difference between the terms ‘hydrolysis’ and ‘hydration’ ?

Explanation

Hydrolysis involves the interaction of `H^(+)` and `OH^(-)` ions of water with the anion and cation of a salt respectively to form the original acid and the original base. For example,
`underset("Salt")(NH_(4)Cl(s))+underset("Water")(H_(2)O(l))tounderset("Original acid")(HCl(aq))+underset("Original base")(NH_(4)OH(aq))`
On the other hand, hydration involves addition of water to the molecules or ions of a salt to form hydrated salt or hydrated ions. For example,
`underset("Salt")(CuSO_(4))+underset("Water")(5H_(2)O)tounderset("Hydrated salt")(CuSO_(4).5H_(2)O)`
`underset("Salt")(Na^(+)Cl^(-)(s))+underset("Water")(H_(2)O(l))tounderset("Hydrated ions")(Na^(+)(aq)+Cl^(-)(aq))`