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slaked lime, Ca(OH)2, a strong base; colorless crystals. Density, 2.24 g per cm3.
Commercial calcium hydroxide is a fluffy white powder. It dehydrates to CaO when heated. Calcium hydroxide is only slightly soluble in water: 0.165 g per 100 g H2O at 20°C and 0.077 g at 100°C. Its solubility increases sharply in the presence of salts. An aqueous solution of calcium hydroxide is known as lime water; a suspension is known as milk of lime. Calcium hydroxide readily absorbs atmospheric carbon dioxide: Ca(OH)2 + CO2 = CaCO3 + H2O. The compound serves as an inexpensive alkali. It is also used in construction.