Calcium Hydroxide (Ca(OH)2)

Name of compound : Calcium Hydroxide (Ca(OH)2) Name and brief about the process : By spraying water on quicklime. Related chemical reaction : CaO + H2O --> Ca(OH)2 Properties : 1. It is a white amorphous powder. 2. It is sparingly soluble in water. 3. Its solubility in hot water is less than that of cold water. Hence solubility decreases with increase in temperature. 4. The aqueous solution is known as lime water and a suspension of slaked lime in water is known as milk of lime. 5. When carbon dioxide is passed through lime water it turns milky due to the formation of calcium carbonate. Ca(OH)2 + CO2 --> CaCO3 + H2O On passing excess of carbon dioxide, the precipitate dissolves to form calcium hydrogen carbonate. Milk of line reacts with chlorine to form hypochlorite, a constituent of bleaching powder. 2Ca(OH)2 +2Cl2 --> CaCl2 + CaCl2 + H2O2 Uses : 1. It is used in the preparation of mortar, a build material. 2. It is used in white wash due to its disinfectant nature. 3. It is used in glass making , in tanning industry , for the preparation of bleaching powder and for purification of sugar.