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Encyclopedia > Copper (II) sulfate

Copper (II) sulfate (CuSO4) is the most common copper salt, made by the action of sulfuric acid on the base copper oxide. Copper (II) sulfate may appear as a pale green or gray-white powder.

Copper (II) sulfate is a desiccant. As such, it most commonly occurs as the blue hydrate mineral chalcanthite, CuSO4 5H2O, which dehydrates at 110C. It decomposes at 600C forming CuO and Cu2O.

It can be used to plate metals with copper, as a fungicide or herbicide, or as a chemical test for water (the anhydrous form will absorb water, turning blue).

The archaic name for Copper (II) sulfate was Cupric sulfate. Some common names are: Blue Stone and Blue Vitriol.



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