(a) Identify the compound of calcium which is used for plastering of fractured bones. With the help of chemical equations show how it is prepared. What special precautions should be taken during the preparation of this compound ?
(b) Name the substance which on treatment with chlorine, yields bleaching powder, Also write chemical equation for its preparation.
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The compound is
(Plaster of Paris) CaSO4.1/2H2O
It is prepared by heating gypsum at 373K (Apx) in large steel pots.
CaSO4.2H2O--> CaSO4.1/2H2O + 3/2H2O
Gypsum. Heat plaster of Paris
Precautions
The temperature should be carefully controlled, if temperature is quite high gypsum will be fully dehydrated. And dehydrated gypsum is totally different from plaster of Paris.
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