Question

How many water molecules does hydrated calcium sulphate contain?

Answer 1

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Explanation:

Hydrated Calcium Sulfate [CaSO

4

.xH

2

O] contains 21% (by mass)of water of crystallization. The number of molecules of water of crystallization, i.e., 'x' in the hydrate compound is:

(Ca=40, S=32, O=16, H=1)

Answer 2

Hydrated calcium sulphate contains 2 water molecules.

• This is a conceptual memory question about the water of crystallisation.
• CaSO4 reacts with two water molecules to generate gypsum.
• Water molecules are bonded together with the chemical by hydrogen bonding, a type of special bonding.
• Water exists in two states of combination in crystalline salts, which are characterised by the words water of constitution and water of crystallisation.
• Because the water of crystallisation is less deeply connected with the salt than the water of constitution, it is more easily evacuated.

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