Home | | Chemistry 11th std | Calcium hydroxide: Preparation, Properties, Uses

Chapter: 11th Chemistry : Alkali and Alkaline Earth Metals

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Calcium hydroxide: Preparation, Properties, Uses

It is a white powder. It is sparingly soluble in water.

Calcium hydroxide

 

Preparation

 

Calcium hydroxide is prepared by adding water to quick lime, CaO.

 

Properties

 

It is a white powder. It is sparingly soluble in water. The aqueous solution is known as lime water and a suspension of slaked lime in water is 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 hydrogen carbonate.

 

CaCO3 + CO2 + H2 → 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

 

Uses:

 

Calcium hydroxide is used

 

i.               in the preparation of mortar, a building material.

ii.               in white wash due to its disinfectant nature.

iii.               in glass making, in tanning industry, in the preparation of bleaching powder and for the purification of sugar.

 


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