Calcium Oxide, CaO
Calcium Oxide, CaO
Calcium Oxide or Quick Lime is prepared on a commercial
scale by heating limestone (CaCO3) in a rotary kiln at 1070-1270 K.
The carbon dioxide is removed as soon as it is produced to
enable the reaction to proceed to completion.
Calcium Oxide or Quick Lime is a white amorphous solid. It has
a melting point of 2870 K. On exposure to atmosphere; it absorbs moisture and
carbon dioxide.
CaO + H2O → Ca(OH)2
CaO + CO2 → CaCO3
The addition of limited amount of water breaks the lump of
lime. This process is called slaking of lime. Quick lime slaked with soda gives
solid sodalime. Being a basic oxide, it combines with acidic oxides at high
temperature.
CaO + SiO2 → CaSiO3
6CaO + P4O10 → 2Ca3(PO4)2
Uses
- It is an important primary material for manufacturing cement and is the cheapest form of alkali.
- It is used in the manufacture of sodium carbonate from caustic soda.
- It is employed in the purification of sugar and in the manufacture of dye stuffs.
Hybrid orbital of cao
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