Question

Write a equation to show the reaction between Plaster of Paris and Water

Answer 1

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${\boxed{CaSO_4. \frac{1}{2}H_ {2}O + \frac{3}{2}H_ {2}O \xrightarrow CaSO_{4}2H_ {2}O}}$

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.

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Answer 2

The chemical reaction between plaster of Paris and water can be depicted as :

CuSO₄.1/2H₂O + 3/2 H₂O --------> CaSO₄.2H₂O (plaster of pars) (gypsum)

• Plaster of Paris is also known as calcium sulfate hemihydrate.
• The above reaction is exothermic. The heat is released through the water of crystallization to form gypsum.
• When POP is mixed with water it rehydrates to form gypsum or calcium sulfate dihydrate.
• Gypsum upon heating turns into hemihydrate (plaster of Paris) or anhydrous depending on the temperature.
• Mineral bassanite is the natural form of the compound.
• Plaster of Paris tends to set into a hard mass on wetting with water.

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