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A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moul...

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A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound is left in open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt. Why does it show such a behaviour? Give the reaction involved.

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Salt is CaSO4 1/2H2O, Plaster of Paris, white soft substance. It can be dough, moulded into different shapes, as 2 moles of CaSO4 share 1 mole of H2O molecule.

CaSO4 1/2H2O + 3/2H4O → CaSO42H2O

When it is left in open, it becomes solid mass CaSO42H2O (Gypsum) which cannot be used for moulding purposes as it is hard solid mass.

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