A White Chemical Compound Becomes Hard On Mixing Proper Quantity Of Water. It Is Also Used To Maintain Joints In Fixed Position.
• Name The Chemical Compound And Write Its Chemical Formula.
• Write The Chemical Equation To Show What Happens When Water Is Added To This Compound In Proper Quantity.
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Answers
• Compound Name : Plaster of Paris
Chemical Formula : The chemical formula of plaster of Paris is CaSO4. 1/2H2O ( Calcium Sulphate hemihydrate )
• The name plaster of Paris came from the fact that it was first of all made by heating gypsum which was mainly found in Paris. The compound plaster of Paris is prepared by heating gypsum at 120oC.
CaSO4.2H2O → CaSO4.1/2H2O + 3/2H2O
Answer:
Plaster of Paris(Calcium sulfate hemihydrate)
(CaSO4)2.H2O or Ca2H2O9S2
Plaster of Paris when reacts with water liberating heat through crystallization. Gypsum is produced by heating plaster of paris to about 150-degree Celsius. When the dry plaster of paris powder is mixed with water it reforms into gypsum. Depending upon the temperature gypsum converts to hemihydrate or anhydrous form.
(CaSO4)2.H2O + 3/2 H2O = CaSO4.2 H2O