A caustic substance (Ca(OH)2) produced by heating limestone; SYN. lime, slaked lime, hydrated lime, calcium hydrate, caustic lime, lime hydrate.
Ca(OH)2 or slaked lime white solid, slightly soluble in water. A solution of calcium hydroxide is called limewater and is used in the laboratory to test for the presence of carbon dioxide. It is manufactured industrially by adding water to calcium oxide (quicklime) in a strongly exothermic reaction.
CaO + H2O ® Ca(OH)2
It is used to reduce soil acidity and as a cheap alkali in many industrial processes.