Question

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 state why does it shows such a behaviour. Give the reaction involved.

September 29, 2024

Answer

The sulphate salt you are referring to is likely calcium sulfate hemihydrate, commonly known as gypsum or more specifically in its solid form as plaster of Paris.

Explanation:

1. Physical properties: Plaster of Paris is a white, soft powder that can be mixed with water to form a malleable dough. This dough can be shaped into various forms.

2. Setting reaction: When the plaster of Paris is exposed to air (or when it sets), it reacts with moisture and begins to harden. This is because it partially rehydrates to form solid calcium sulfate dihydrate (gypsum), which is a more stable form.

Reaction involved:

The reaction can be represented as follows:

CaSO4⋅½H2O + H2O → CaSO4⋅2H2O

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