CBSE Class 11-science Answered
describe the preparation and use of
quick lime
plaster of paris
Asked by Aakrati Gawande | 27 Mar, 2014, 12:24: PM
Expert Answer
Quick lime or Calcium oxide (CaO)
It is prepared on a commercial scale by heating limestone(CaCO3) in a rotary kiln at 1070-1270 K.
CaCO3 
CaO + CO2
CaO + CO2The carbon dioxide is removed as soon as it is produced to enable the reaction to proceed to completion.
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.
Plaster of Paris or Calcium Sulphate( CaSO4. 1/2H2O)
It is a hemihydrate of calcium sulphate and is obtained when gypsum is heated to 393K.
2(CaSO4.2H2O) → 2(CaSO4).H2O + 2H2O
Uses:
•Used in hospitals as plaster for supporting fractured bones in the right position.
•Used for making decorative materials and for making surfaces smooth.
•Used as a fire-proofing material
Answered by | 27 Mar, 2014, 12:38: PM
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