is calcium hydroxide organic
For (Ca(OH) 2) (aq) , see limewater. For the application of slaked lime as a wall colorant, see limewash. Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula Ca (OH) 2.It is a colorless crystal or white powder and is obtained when calcium oxide (called lime or quicklime) is mixed, or  slaked  with water. suspension of fine calcium hydroxide particles in water is called milk of lime. The solution is called limewater 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 called carbonatation :