Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula Ca2. It is a colorless crystal or white powder and is obtained when calcium oxide is mixed, or "slaked" with water.
 
It has many names including hydrated lime, builders lime, slack lime,Chuna  cal  or pickling lime. Calcium hydroxide is used in many applications. Limewater is the common name for a saturated solution of calcium hydroxide
 
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