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Question

How is plaster of paris obtained ? What reaction is involved in the setting of a paste of plaster of paris? What is it used for?  [3 MARKS]
 


Solution

Explanation: 3 Marks

1. Plaster of Paris is obtained by heating gypsum at 373 K. It loses water molecules and becomes CaSO4.(12)H2O. The reaction involved is:

       CaSO4.2H2OCaSO4.(12)H2O+32H2O

      Gypsum            Plaster or Paris

2. When Plaster of Paris is mixed with water, it gets converted into gypsum.

       CaSO4.(12)H2O+(32)H2OCaSO4.2H2O

      Plaster of Paris                        Gypsum

3. Plaster of Paris is used for making statues and for setting of fractured bones by making cast around the fractured limbs.


Chemistry

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