Copper sulfate Molecular formula-------CuSO4 Molar mass-------159.61 g/mol (anhydrous) 249.68 g/mol (pentahydrate) Density-------3.603 g/cm3 (anhydrous) 2.284 g/cm3 (pentahydrate) Melting point------110 °C (4H2O) 150 °C (423 K) (5H2O) < 650 °C decomp. Solubility in water------31.6 g/100 ml (0 °C) Solubility: anhydrous insoluble in ethanol Pentahydrate soluble in methanol and ethanol Copper sulfate is the chemical compound with the 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 gray-white powder, whereas the pentahydrate, the most commonly encountered salt, is bright blue. The anhydrous form occurs as a rare mineral known as chalcocyanite. The hydrated copper sulfate occurs in nature as chalcanthite (pentahydrate), and two more rare ones: bonattite (trihydrate) and boothite (heptahydrate). Archaic names for copper sulfate are "blue vitriol" and "bluestone".
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