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".