![]() The hexahydrate is a metal aquo complex consisting of octahedral 2+ ions associated with sulfate anions (see image in table). The hexahydrate converts to the monohydrate and the anhydrous forms at 100 and 250 ☌, respectively. ![]() The heptahydrate is only stable at humidity >70% at room temperature, otherwise it converts to the hexahydrate. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans.It forms by the reaction of metallic cobalt, its oxide, hydroxide, or carbonate with aqueous sulfuric acid: Co + H 2SO 4 + 7 H 2O → CoSO 4(H 2O) 7 + H 2 CoO + H 2SO 4 + 6 H 2O → CoSO 4(H 2O) 7
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