Question

when crystals of copper sulphate are strongly heated, the residue obtained is .......... in colour.

Answer 1

Crystals of Copper Sulphate are hydrated and thus it is known as hydrated Copper Sulphate.

Hydrated Copper Sulphate is blue in color.

When Hydrated Copper Sulphate is heated a reversible reaction occurs where the Hydrated Copper Sulphate loses water to become anhydrous Copper Sulphate which is a white powder.

The equation of this reaction is given by:

Hydrated Copper Sulphate(blue) + Heat ⇄ Anhydrous Copper Sulphate (white) +Water