Copper Sulphate CuS04
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Copper(II) sulfate, also known as cupric sulfate or Copper Sulphate, is the chemical compound with the chemical formula CuS04. 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 (CuS04·5H2O), the most commonly encountered salt, is bright blue. CuS04·5H2O is in a shade of blue, and very toxic to the environment, irritating to the eyes and skin, and also can be harmful if swallowed. Copper(II) sulfate 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) sulfate are “blue vitriol” and “bluestone”.