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