Answer:
Water has two ions, \[{{H}^{+}}\] and\[O{{H}^{-}}\].
The interaction of these ions with anion and cation of the salt to give the original
acid and the base is termed hydrolysis.
\[\underset{Salt}{\mathop{AlC{{l}_{3}}}}\,+3HOH\to
\underset{Base}{\mathop{Al{{(OH)}_{3}}}}\,+\underset{Acid}{\mathop{3HCl}}\,\]
Addition of
water as such to ions or molecules is termed hydration.
\[KCl+{{H}_{2}}O\to {{K}^{+}}(aq)+C{{l}^{-}}(aq)\]
\[CuS{{O}_{2}}+5{{H}_{2}}O\to
CuS{{O}_{4}}.5{{H}_{2}}O\]
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