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A sulphate salt of group 2 element of th...

A sulphate salt of group 2 element of the periodic tables is a white soft substance which can be moulded in to 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 sulphates salt and why does it show such a behaviour ? Give the reaction involved .

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The substance which is used for making different shapes is Plaster of Paris . Its chemical name is calcium sulphate hemihydrate `(CaSO_(4).1//2H_(2)O)` . The two formula unit of `CaSO_4` share one molecule of water . As a result, it is soft.
When it is left open for some time. it absorbs moisture from the atmosphere and forms gypsum, which is a hard solid mass.
`underset(("Sulphate salt"))underset(("Soft"))underset("Plaster of Pairs")(CaSO_(4).1/2H_(2)O)+1(1)/(2)H_(2)Orarrunderset(("Hard mass"))underset("Gypusm")(CaSO_(4).2H_(2)O`
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