Why is copper sulphate called?

Copper sulphate is named after its constituent elements: copper (Cu) and the sulfate ion (SO4²⁻).

Chemical nomenclature follows systematic rules. The name breaks down as:

• Copper: The metal cation (Cu²⁺) present in the compound
• Sulfate: The polyatomic anion (SO₄²⁻) consisting of sulfur and oxygen

The "(II)" notation specifies copper's +2 oxidation state, distinguishing it from copper(I) compounds. Historical names like "blue vitriol" come from its blue crystalline appearance, where "vitriol" was an old term for sulfate salts.