Cobalt(II,III) oxide

Cobalt(II,III) oxide is a chemical compound. It contains some (1 atom) cobalt in the +2 oxidation state and some (2 atoms) in the +3 oxidation state. Its chemical formula is Co3O4. It contains cobalt and oxide ions.

Properties
It is a black solid. It reacts with hydrochloric acid to make chlorine and cobalt(II) chloride.

Preparation
It is made when cobalt(II) oxide is heated to . When it is heated to , it turns back into cobalt(II) oxide.

Uses
It has been used in research for making hydrogen.

Safety
It is irritating to the skin. It can cause harm if swallowed. It dissolves in the stomach acid.

Related pages
Iron(II,III) oxide
Cobalt(III) oxide

Category:Cobalt compounds
Category:Oxides