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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 and why does it show such a behaviour? Give the reaction involved.
The sulphate salt is is commonly known as plaster of Paris. The chemical formula is
It is soft due to the presence of water crystallisation. It readily reacts with atmospheric moisture, forming a hard solid mass.
is the name given to this solid mass.
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