Hydrolysis is a chemical reaction in which substance reacts with water under neutral, acidic or alkaline conditions. For example, aluminium chloride is hydrolysed by water as follows:
`AlCl_(3)+3H_(2)O to Al(OH)_(3)+3HCl`
Hydration on the other hand is the property of a chemical compound to take up molecules of water of crystallisation and get hydrated. For example, anhydrous copper sulphate `(CuSO_(4))` Which is white in colour takes up five molecules of `H_(2)O` to form hydrated copper sulphate `(CuSO_(4).5H_(2)O)` which has blue colour.
`underset("Anhydrous whihte")(CuSO_(4)(s))+5H_(2)O(l) to underset("Hydrated-blue")(CuSO_(4).5H_(2)O)`
