Identify the compound of calcium which is used for plastering of fractured bones with the help of chemical equations show how is it prepared and what special precautions should be taken during the preparation of this comlund
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Calcium Sulphate hemihydrate is used for plastering of fractured bones.
On heating gypsum at 373 K or 100 degree celcius the water molecules are lost and Plaster of Paris or Calcium Sulphate Hemihydrate is formed.
CaSO4.2H20 = (at 100 degree celcius) CaSO4.1/2 H2O + 1 1/2 H20
Plaster of Paris changes to Gypsum in the presence of moisture. This Gypsum sets as a hard solid mass and thus plaster of paris ecomes useless.
On heating gypsum at 373 K or 100 degree celcius the water molecules are lost and Plaster of Paris or Calcium Sulphate Hemihydrate is formed.
CaSO4.2H20 = (at 100 degree celcius) CaSO4.1/2 H2O + 1 1/2 H20
Plaster of Paris changes to Gypsum in the presence of moisture. This Gypsum sets as a hard solid mass and thus plaster of paris ecomes useless.
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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.
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