Calcium Hydroxide, Ca(OH)2
Calcium Hydroxide, Ca(OH)2
Calcium Hydroxide or Slake lime is prepared by adding water
to quick lime, CaO.
It is a white amorphous powder. It is sparingly soluble in
water. The aqueous solution is known as lime water and a suspension of slaked
lime in water known as milk of lime.
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 hydrogencarbonate.
CaCO3
+ CO2 + H2O → Ca(HCO3)2
Milk of lime reacts with chlorine to form hypochlorite, a
constituent of bleaching powder.
2Ca(OH)2 +
2Cl2 → CaCl2 +
Ca(OCl)2 + 2H2O
Bleaching powder
Uses
- It is used in the preparation of mortar, a building material.
- It is used in white wash due to its disinfectant nature.
- It is used in glass making, in tanning industry, for the preparation of bleaching powder and for purification of sugar.
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