Cobalt(II) fluoride

Cobalt(II) fluoride, also known as cobaltous fluoride, is a chemical compound. Its chemical formula is CoF2. It contains cobalt in its +2 oxidation state. It also contains fluoride ions.
Properties.
It is a reddish crystalline solid. It only dissolves a little in water. The hydrate (type with water molecules attached) can dissolve in water. It can dissolve in acid. It can react with hydrogen at to make cobalt and hydrogen fluoride. 
Preparation.
It can be made by reacting anhydrous (without any water molecules attached) cobalt(II) oxide or cobalt(II) chloride with a stream of hydrogen fluoride. This reaction makes the anhydrous form. The hydrated (with water molecules attached) form is made by reacting any cobalt(II) compound with hydrofluoric acid. When fluorine is reacted with cobalt at a high temperature, it makes both cobalt(II) fluoride and cobalt(III) fluoride.
Uses.
It is used as a catalyst. It can be used as a source of the fluoride ion in dentist care. It is used in lenses.