Question

Why is pop written as cuso4.1/2h2o.How is it possible to have half a water molecule attached to cuso4?

Answer 1

Answer: Plaster of paris is Calcium sulphate hemihydrate . [CaSO4.1/2 H2O]

Please Note that it is not possible to have a half a molecule of water.

The Formula actual means that two molecules ( or two formula units ) of CaSO4 share one moecule of water so that the effective water of crystallisation for one CaSO4 unit comes to half molecule of water.

The formula of plaster of paris can be written as 2CaSO4.H2O

2(CaSO4.2H2O)  -----> 2CaSO4.H20  + 3 H2O on heating

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Answer 2

Explanation:

The chemical formula of Plaster Of Paris is CaSO$_{4}$·1/2H$_{2}$O

This would first seem impossible, cause how can a half molecule of water exist and be attached to one molecule of Calcium Sulphate?

This is not what " CaSO$_{4}$·1/2H$_{2}$O " means, this is so because 2 Formula Unit of Calcium Suplahte is attached to 1 Formula Unit of Dihydrogen Oxide (Scientific name of WATER).

Therefore, we write Calcium Sulphate Hemihydrate as CaSO$_{4}$·1/2H$_{2}$O