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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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**Step-by-step Solution:** 1. **Identify the Sulfate Salt**: The sulfate salt of a group 2 element that fits the description is Calcium Sulfate Hemihydrate, which is represented as CaSO₄·½H₂O. This compound is commonly known as Plaster of Paris (POP). 2. **Properties of Plaster of Paris**: Plaster of Paris is a white soft substance that can be easily molded into different shapes when mixed with water to form a dough-like consistency. This property makes it useful in various applications, including construction and art. 3. **Behavior Upon Exposure to Air**: When Plaster of Paris is left exposed to air for some time, it absorbs moisture from the atmosphere. This moisture absorption leads to a chemical reaction where the hemihydrate form (CaSO₄·½H₂O) converts into the dihydrate form (CaSO₄·2H₂O). ...
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