(a) By adding water to quick lime we can prepare Ca(OH)2 . This process is called slaking.
CaO + H2O → Ca(OH)2
When CO2 is passed through lime water we can prepare CaCO3 .
Ca(OH) + CO → CaCO + H O
(b) 1. As an important primary material for manufacturing cement.
2. In the manufacture of Na2CO3 from NaOH.