Question

Write an equation to show the reaction between plaster of paris and water?

Answer 1

CaSO4. 1/2 H2O + 1 1/2 H2O= CaSO4. 1/2 H20.

Answer 2

Answer :-

⇒ CaSO4.1/2 H2O+ 3/2 H2O--> CaSO4.2H2O

Explanation :-

• Chemical name :- Calcium sulphate hemihydrate.
• It is obtained by heating gypsum at 120°C.
• It loses water of crytalization at 473 K.
• It is used for plastering fractured bones, making toys, decorative materials, surgical instrument, blackboard chalk.
• It is white in colour.
• It sets into hard mass on adding water.