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{{Short description|Inorganic compound of formula Ca(OH)<sub>2</sub>}}
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'''Calcium hydroxide''' (traditionally called '''slaked lime''') is an [[inorganic compound]] with the chemical formula [[calcium|Ca]]([[Hydroxide|OH]])<sub>2</sub>. It is a colorless crystal or white powder and is produced when quicklime ([[calcium oxide]]) is mixed with [[water]].
Calcium hydroxide has many names including '''hydrated lime''', '''caustic lime''', '''builders' lime''', '''slaked lime''', '''cal''', and '''pickling lime'''. Calcium hydroxide is used in many applications, including food preparation, where it has been identified as [[E number]] '''E526'''. '''
==Solubility==
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: Ca(OH)<sub>2</sub> → CaO + H<sub>2</sub>O
When carbon dioxide is passed through limewater, the solution takes on a milky appearance due to [[precipitation (chemistry)|precipitation]] of insoluble [[calcium carbonate]]:
: Ca(OH)<sub>2</sub>{{sub|({{serif|''aq''}})}} + CO<sub>2</sub>{{sub|({{serif|''g''}})}} → CaCO<sub>3</sub>{{sub|({{serif|''s''}})}} + H<sub>2</sub>O{{sub|({{serif|''l''}})}}
If excess CO<sub>2</sub> is added: the following reaction takes place:
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