Cobalt sulfate appears as red monoclinic crystals that liquify around 100 Â°C and become anhydrous at 250 Â°C. It is soluble in water, slightly soluble in ethanol, and especially soluble in . The salts are paramagnetic. It forms by the reaction of metallic cobalt, its oxide, hydroxide, or carbonate with aqueous sulfuric acid. Cobalt sulfate is used in the preparation of pigments and electroplating, and as an additive to soils and animal feeds. For these purposes, the cobalt sulfate is produced by treating cobalt oxide with sulfuric acid.