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
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.028.949 Edit this at Wikidata
EC Number
  • 231-843-4
RTECS number
  • NO5400000
UNII
  • InChI=1S/2ClH.Fe/h2*1H;/q;;+2/p-2 checkY
    Key: NMCUIPGRVMDVDB-UHFFFAOYSA-L checkY
  • InChI=1/2ClH.Fe/h2*1H;/q;;+2/p-2
    Key: NMCUIPGRVMDVDB-NUQVWONBAL
  • anhydrous: Cl[Fe]Cl
  • tetrahydrate: Cl[Fe-4](Cl)([OH2+])([OH2+])([OH2+])[OH2+]
Properties
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)
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
+14750·10−6 cm3/mol
Structure
Monoclinic
Octahedral at Fe
Pharmacology
B03AA05 (WHO)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
NIOSH (US health exposure limits):
REL (Recommended)
TWA 1 mg/m3[1]
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).
☒N verify (what is checkY☒N ?)

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.

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