18. How many water molecules does hydrated cal-cium sulphate contain?
(a)s
(6) 10
(c) 7 (d) 2
Answers
Answered by
15
The answer is 2.
This a conceptual memory based question of Water of crystallisation.
When CaSO4 has 2 water molecules it is known as gypsum
It can also acquire 1/2 water molecule.
(The molecule doesn’t get halved but 1 water molecule is shared by 2 CaSO4 molecules)hence forming CaSO4.1/2H2O this is known as POP( plaster of Paris) which can be prepared by heating CaSO4.2H2O at exactly 443 K
Hope it helps.
This a conceptual memory based question of Water of crystallisation.
When CaSO4 has 2 water molecules it is known as gypsum
It can also acquire 1/2 water molecule.
(The molecule doesn’t get halved but 1 water molecule is shared by 2 CaSO4 molecules)hence forming CaSO4.1/2H2O this is known as POP( plaster of Paris) which can be prepared by heating CaSO4.2H2O at exactly 443 K
Hope it helps.
Answered by
6
Answer:
(CaSo4.xH2O)
molecular mass=(136+18x)
gm % of water in hydrate compound is
18x*100/(136+18x)=21
x=2
so compound is CaSO4.2H2O
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