Calcium hydroxide, traditionally called slaked lime, is an
inorganic compound with the chemical formula Ca(HO)2. It is a
colorless crystal or white powder and is obtained when calcium
oxide is mixed, or "slaked" with water. Calcium hydroxide is used
in many applications, including food preparation. Limewater is the
common name for a saturated solution of calcium hydroxide.
When heated to 512 °C, the partial pressure of water in equilibrium
with calcium hydroxide reaches 101 kPa, which decomposes calcium
hydroxide into calcium oxide and water.
Ca(OH)2 CaO + H2O
A suspension of fine calcium hydroxide particles in water is called
milk of lime. The solution is calledlimewater and is a medium
strength base that reacts with acids and attacks many metals.
Limewater turns milky in the presence of carbon dioxide due to
formation of calcium carbonate, a process calledcarbonatation:
Ca(OH)2 + CO2 CaCO3 + H2O
It is utilized in bleaching agent,lemon acid,empoxy propane,leather
process,metal production, water treatment,refuse
incineration,purification of sugar juices,ect