Preparation of Cobalt metal

 Place cobalt oxide into a quartz tube and start dry hydrogen stream, heat the cobalt oxide, cobalt oxide will be reduced by hydrogen to cobalt metal and water. Dry hydrogen can be made from sodium hydroxide and aluminum, passing the gas from sulfuric acid to make it dry. Cobalt oxide can be removed from the cobalt metal with acetic acid.

Co3O4 + 4H2 = 3Co + 4H2O
Source

The cobalt oxide

Water condensing

The pure cobalt metal

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