Grade 1210 grade science

Plaster of Paris should be stored in a moisture-proof container. Explain why?

Pawan Prajapati

5 Years agoGrade 12

2 Answers

Harshit Singh

5 Years ago

Dear Student

Plaster of Paris reacts with moisture/water to form gypsum.

Thanks

KAPADIA DEV

5 Years ago

plaster of paris is stored in moisture proof container because when it react with 3/2 molecule of water then it form gypsum

here is equation that show reaction between Plaster Of Paris and water.

CaSO₄ .1/2 H₂O + 3 /2H₂O ==> CaSO₄ .2H₂0

whenever plaster of paris is exposed to air it take 3 by 2 molecules of water and form gypsum.
due to formation of gypsum salt the Plaster of Paris is going hard.
so to prevent it from getting hard it should be kept in moisture proof container not in exposed air .