Cobalt Sulphate (R14733)

Cobalt(II) sulfate heptahydrate appears as red monoclinic crystals that liquify around 100 °C and become anhydrous at 250 °C. It is soluble in water, slightly soluble in ethanol, and especially soluble in methanol. The salts are paramagnetic.

It forms by the reaction of metallic cobalt, its oxide, hydroxide, or carbonate with aqueous sulfuric acid.

The hexahydrate is a metal aquo complex consisting of octahedral [Co(H₂O)₆]²⁺ ions associated with sulfate anions.