Question

Identify the compound of calcium which is used for plastering of fractured bones. With the help of chemical eq. Show how it is prepared and what special precautions should be take during the

Answer 1

Compound of calcium which is used for plastering of fractured bones is Calcium sulphate hemihydrate(CaSO4.1/2H2O)

• This compound is commonly called Plaster of Paris
• The equation is

CasO4.2H2O → Caso4.1/2H2O+1/2H2O (Gypsum). (373K). (plaster of paris)

Prcaution:

• Gypsum should not be heated above 373K
• If so it would form CaSO4

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Answer 2

Answer:

Chemical formula of Plaster of Paris.

CaSO₄. 1/2 H₂O

Preparation :

On heating Gypsum at 373 K Plaster of Paris is formed.

CaSO₄. 2 H₂O    ⇒ CaSO₄. 1/2 H₂O + 3/2 H₂O

Special precaution :

We shouldn't heat gypsum above 373 K else it will not form.