a sulphate salt of group 2 element of the periodic table is a soft and white powder which can be moulded into different shapes by adding water to it.When this compound is left in open for some time it becomes a hard 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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the salt is CaSO4 • ½ H2O or plaster of Paris (calcium sulphate).
when exposed to moisture, it undergoes a reaction:
CaSO4 • ½ H2O + 1 ½ H2O -> CaSO4 • 2 H2O
the new salt formed is gypsum. it is a hard substance which can't be moulded.
when exposed to moisture, it undergoes a reaction:
CaSO4 • ½ H2O + 1 ½ H2O -> CaSO4 • 2 H2O
the new salt formed is gypsum. it is a hard substance which can't be moulded.
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