explain a paper packet containing some crystalline blue vitroil kept on the shelf in the laboratory was forgotten for a few days. after some time,it was discovered that the packet swelled up and bursted and dirty white powder was found in place of the dark blue crystals. How did how did it happen? give reason
Answers
Answer:
Crystals of a substance which changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down are copper sulphate or more specifically hydrated copper sulphate.
Its formula - CuSO
4
.5H
2
O
Explanation:
The phenomena involved is due to the presence of molecules of water of crystallization in the molecule. Water of crystallization is the fixed number of water molecules that are present in one formula unit of a salt. When we heat the crystals of hydrated copper sulphate this water is removed and the salt turns white. But when it is allowed to cool down in open air then it regains its lost water of crystallization and hence regains its colour also.
Answer:
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