What is Cobalt(II) fluoride?
{{chembox | ImageFile = Fluorid kobaltnatý.PNG | ImageFile1 = Cobalt(II)-fluoride-unit-cell-3D-balls.png | IUPACName = Cobalt(II) fluoride | OtherNames = cobalt difluoride | Section1 = {{Chembox Identifiers | ChemSpiderID = 23205 | InChI = 1/Co.2FH/h;2*1H/q+2;;/p-2 | InChIKey = YCYBZKSMUPTWEE-NUQVWONBAL | SMILES = F[Co]F | StdInChI = 1S/Co.2FH/h;2*1H/q+2;;/p-2 | StdInChIKey = YCYBZKSMUPTWEE-UHFFFAOYSA-L | CASNo = 10026-17-2 | PubChem = 24820 | RTECS = GG0770000 | EINECS = 233-061-9 }} | Section2 = {{Chembox Properties | Formula = [[Cobalt|Co]][[Fluorine|F<sub>2</sub>]] | MolarMass = 96.93 g/mol | Appearance = Red crystalline solid | Density = 4.46 g/cm<sup>3</sup> (anhydrous) <br> 2.22 g/cm<sup>3</sup> (tetrahydrate) | MeltingPtC = 1217 | BoilingPtC = 1400 | Solubility = 1.4 g/100 mL (25 °C) | SolubleOther = soluble in [[hydrofluoric acid|HF]] <br> insoluble in [[alcohol]], [[ether]], [[benzene]] }} | Section3 = {{Chembox Structure | CrystalStruct = tetragonal (a,hydrous) <br> orthorhombic (tetrahydrate) }} | Section4 = {{Chembox Hazards | LD50 = oral (rat): 150 mg/kg | NFPA-H = 3 | NFPA-F = 0 | NFPA-R = 2 }} | Section5 = {{Chembox Related | OtherAnions = [[cobalt(II) oxide]], [[cobalt(II) chloride]] | OtherCations = [[iron(II) fluoride]], [[nickel(II) fluoride]] | OtherCpds = [[cobalt trifluoride]] }} }} '''Cobalt(II) fluoride''', also known as '''cobaltous fluoride''', is a [[chemical compound]]. Its [[chemical formula]] is CoF<sub>2</sub>. It contains cobalt in its +2 [[oxidation state]]. It also contains [[fluoride]] [[ion]]s. ==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 {{convert|300|C|F}} 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 hydroge