Solubility: anhydrous insoluble in ethanol
Pentahydrate soluble in methanol and ethanol
Appearance : blue crystalline solid

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

Appearance : blue crystalline solid (pentahydrate)

                    gray-white powder (anhydrous)

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".