CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Hydrated copper sulphate crystals. Copper (II) sulphate, also known as cupric sulphate or copper sulphate, is the chemical compound with the chemical formula CuSO4. This salt exists as a series of compounds that differ in their degree of hydration. The anhydrous form is a pale green or grey-white powder, whereas the pentahydrate (CuSO4 5H2O), the most commonly encountered salt, is bright blue. Copper sulphate exothermically dissolves in water to give the aquo complex (Cu (H2O)6)2+, which has octahedral molecular geometry and is paramagnetic. Other names for copper (II) sulphate are blue vitriol and bluestone.
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