Cobalt(II) chloride

Cobalt(II) chloride
	Hexahydrate
	Anhydrous
Names
	IUPAC name Cobalt(II) chloride
	Other names Cobaltous chloride; Cobalt dichloride; Muriate of cobalt
Identifiers
CAS Number	7646-79-9 ; 16544-92-6 (dihydrate) ; 7791-13-1 (hexahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; hexahydrate: Interactive image;
ChEBI	CHEBI:35696 ;
ChemSpider	22708 ;
ECHA InfoCard	100.028.718
EC Number	231-589-4;
PubChem CID	3032536;
RTECS number	GF9800000;
UNII	EVS87XF13W ; 17AVG63ZBC (hexahydrate) ;
UN number	3288
CompTox Dashboard (EPA)	DTXSID9040180 ;
	InChI InChI=1S/2ClH.Co/h21H;/q;;+2/p-2 Key: GVPFVAHMJGGAJG-UHFFFAOYSA-L ; InChI=1/2ClH.Co/h21H;/q;;+2/p-2 Key: GVPFVAHMJGGAJG-NUQVWONBAU;
	SMILES anhydrous: Cl[Co]Cl; hexahydrate: Cl[Co-4](Cl)([OH2+])([OH2+])([OH2+])[OH2+].O.O;
Properties
Chemical formula	CoCl2
Molar mass	129.839 g/mol (anhydrous) ; 165.87 g/mol (dihydrate) ; 237.93 g/mol (hexahydrate)
Appearance	blue crystals (anhydrous) ; violet-blue (dihydrate) ; rose red crystals (hexahydrate)
Density	3.356 g/cm3 (anhydrous) ; 2.477 g/cm3 (dihydrate) ; 1.924 g/cm3 (hexahydrate)
Melting point	726 °C (1,339 °F; 999 K) ±2 (anhydrous) ; 140 °C (monohydrate) ; 100 °C (dihydrate) ; 86 °C (hexahydrate)
Boiling point	1,049 °C (1,920 °F; 1,322 K)
Solubility in water	43.6 g/100 mL (0 °C) ; 45 g/100 mL (7 °C); 52.9 g/100 mL (20 °C) ; 105 g/100 mL (96 °C)
Solubility	38.5 g/100 mL (methanol) ; 8.6 g/100 mL (acetone) ; soluble in ethanol, pyridine, glycerol
Magnetic susceptibility (χ)	+12,660·10−6 cm3/mol
Structure
Crystal structure	CdCl2 structure
Coordination geometry	hexagonal (anhydrous) ; monoclinic (dihydrate) ; Octahedral (hexahydrate)
Hazards
	GHS labelling:
Pictograms
NFPA 704 (fire diamond)	3 0 0
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	80 mg/kg (rat, oral)
Safety data sheet (SDS)	ICSC 0783
Related compounds
Other anions	Cobalt(II) fluoride; Cobalt(II) bromide; Cobalt(II) iodide
Other cations	Rhodium(III) chloride; Iridium(III) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cobalt(II) chloride is an inorganic compound, a salt of cobalt and chlorine, with the formula CoCl
₂. The compound forms several hydrates CoCl
₂·nH
₂O, for n = 1, 2, 6, and 9. Claims of the formation of tri- and tetrahydrates have not been confirmed. The anhydrous form is a blue crystalline solid; the dihydrate is purple and the hexahydrate is pink. Commercial samples are usually the hexahydrate, which is one of the most commonly used cobalt salts in the lab.