Question

1) Write any two uses of Plaster of Paris
ii) Write the chemical equation to show the
reaction between Plaster of Paris and water​

Answer 1

Answer:

It is used to support fractured bones and to make craft

Answer 2

1. It is commonly used to precast and hold parts of ornamental plasterwork placed on ceilings and cornices. It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern orthopedic casts are made of fibreglass or thermoplastic

ii) 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.

CaSO4.21H2O+Water23H2O⟶GypsumCaSO4.2H2O