Cobalt(II,III) oxide
chemical compound
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 change
It is a black solid. It reacts with hydrochloric acid to make chlorine and cobalt(II) chloride.
Preparation change
It is made when cobalt(II) oxide is heated to 600 °C (1,112 °F). When it is heated to 900 °C (1,650 °F), it turns back into cobalt(II) oxide.
Uses change
It has been used in research for making hydrogen.
Safety change
It is irritating to the skin. It can cause harm if swallowed. It dissolves in the stomach acid.