Preparation of Calcium Hydroxide From quick lime Calcium hydroxide is prepared on a commercial scale by adding water to quicklime. This process is called slaking of lime. CaO + H2O ----> Ca(OH)2 From calcium chloride It is also obtained by treating calcium chloride with caustic soda. Properties of Calcium Hydroxide 1) It is a white amorphous powder … [Read more...] about Calcium Hydroxide