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Copper(II) sulfate (spelled "copper sulphate" in
the UK) is the chemical
compound with the formulaCuSO4. This salt exists as a series
of compounds that differ in their degree of hydration. The anhydrous form is a pale green or
gray-white powder, whereas the pentahydrate (CuSO4·5H2O), the most commonly encountered salt,
is bright blue. Copper sulfate dissolves in water to give the
aquo complex [Cu(H2O)6]2+, which has octahedral molecular geometry and is
paramagnetic. Archaic names
for copper(II) sulfate are "blue vitriol" and "bluestone".
