Iron(II) chloride

Iron(II) chloride
Anhydrous	Tetrahydrate
Structure of anhydrous ferrous chloride ( Fe, Cl)	structure of tetrahydrate
Names
	IUPAC names Iron(II) chloride; Iron dichloride
	Other names Ferrous chloride; Rokühnite
Identifiers
CAS Number	7758-94-3 ; 16399-77-2 (dihydrate) ; 13478-10-9 (tetrahydrate) ;
3D model (JSmol)	anhydrous: Interactive image; tetrahydrate: Interactive image;
ChEBI	CHEBI:30812 ;
ChemSpider	22866 ;
ECHA InfoCard	100.028.949
EC Number	231-843-4;
PubChem CID	24458;
RTECS number	NO5400000;
UNII	S3Y25PHP1W ;
CompTox Dashboard (EPA)	DTXSID9029695 ;
	InChI InChI=1S/2ClH.Fe/h21H;/q;;+2/p-2 Key: NMCUIPGRVMDVDB-UHFFFAOYSA-L ; InChI=1/2ClH.Fe/h21H;/q;;+2/p-2 Key: NMCUIPGRVMDVDB-NUQVWONBAL;
	SMILES anhydrous: Cl[Fe]Cl; tetrahydrate: Cl[Fe-4](Cl)([OH2+])([OH2+])([OH2+])[OH2+];
Properties
Chemical formula	FeCl2
Molar mass	126.751 g/mol (anhydrous); 198.8102 g/mol (tetrahydrate)
Appearance	Tan solid (anhydrous); Pale green solid (di-tetrahydrate)
Density	3.16 g/cm3 (anhydrous) ; 2.39 g/cm3 (dihydrate) ; 1.93 g/cm3 (tetrahydrate)
Melting point	677 °C (1,251 °F; 950 K) (anhydrous) ; 120 °C (dihydrate) ; 105 °C (tetrahydrate)
Boiling point	1,023 °C (1,873 °F; 1,296 K) (anhydrous)
Solubility in water	64.4 g/100 mL (10 °C),; 68.5 g/100 mL (20 °C),; 105.7 g/100 mL (100 °C)
Solubility in THF	Soluble
log P	−0.15
Magnetic susceptibility (χ)	+14750·10−6 cm3/mol
Structure
Crystal structure	Monoclinic
Coordination geometry	Octahedral at Fe
Pharmacology
ATC code	B03AA05 (WHO)
Hazards
NFPA 704 (fire diamond)	3 0 0
	NIOSH (US health exposure limits):
REL (Recommended)	TWA 1 mg/m3
Safety data sheet (SDS)	Iron (II) chloride MSDS
Related compounds
Other anions	Iron(II) fluoride; Iron(II) bromide; Iron(II) iodide
Other cations	Cobalt(II) chloride; Manganese(II) chloride; Copper(II) 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

Iron(II) chloride, also known as ferrous chloride, is the chemical compound of formula FeCl₂. It is a paramagnetic solid with a high melting point. The compound is white, but typical samples are often off-white. FeCl₂ crystallizes from water as the greenish tetrahydrate, which is the form that is most commonly encountered in commerce and the laboratory. There is also a dihydrate. The compound is highly soluble in water, giving pale green solutions.

^ NIOSH Pocket Guide to Chemical Hazards. "#0346". National Institute for Occupational Safety and Health (NIOSH).

[1] NIOSH Pocket Guide to Chemical Hazards. "#0346". National Institute for Occupational Safety and Health (NIOSH).

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