Advertisements
Advertisements
Question
What is gypsum? What happens when gypsum is heated to 100°C (373 K)?
Solution
Gypsum is calcium sulphate dihydrate (CaSO4.2H2O). When gypsum is heated to a temperature of 100⁰C (373K), it loses three-fourths of its water of crystallisation and forms plaster of Paris (CaSO4.1/2H2O).
APPEARS IN
RELATED QUESTIONS
Write an equation to show the reaction between Plaster of Paris and water.
What is the commercial name of calcium sulphate hemihydrate?
Name the compound which is used in hospitals for setting fractured bones.
Name the raw material used for the preparation of plaster of Paris.
Which property of plaster of Paris is utilised in making casts for broken limbs in hospitals?
Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:
(a) CaSO3.2H2O
(b) CaCl2.2H2O
(c) CaCO3.2H2O
(d) CaSO4.2H2O
Consider the following substances:
NaCl, Ca(OH)2, NaHCO3, NH3, Na2CO3, H2O, Cl2, CO2, CaSO4.2H2O, 2CaSO4.H2O, CaOCl2
Which compound represents plaster of Paris?
A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.
Identify the compound X
How many molecules of water of crystallisation (per formula unit) are present in:
gypsum?
Analogy:
Blackboard chalks: ______:: Plant growth: Epsum.
