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The formula o...

Question

The formula of Plaster of Paris is CaSO4.1/2 H2O. How does half a molecule of water exist in this compound?

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Solution

One molecule of water is shared between two molecules of calcium sulphate and hence the formula is CaSO₄.1/2H₂O. It can also be written as 2CaSO₄.H₂O.

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