Original: Cobalt (II) oxide (CoO) and cobalt (II) fluoride (CoF2) can also be converted to cobalt (III) fluoride using fluorine.
Simplified: It reacts with water to make hydrofluoric acid, oxygen, and cobalt (II) fluoride. It is made by reacting cobalt (II) chloride and fluorine at 350 C. Cobalt (II) oxide and cobalt (II) fluoride can be used instead of the cobalt (II) chloride.