Ferrous chloride

Ferrous chloride Basic information
Occurrence and Uses Physical Properties Preparation
Product Name:Ferrous chloride
Synonyms:Ferro 66;ferro66;Ferrofloc;ferrouschloride,solid;ferrouschloride,solution;ferrousdichloride;Iron chloride (FeCl2);Iron protochloride
CAS:7758-94-3
MF:Cl2Fe
MW:126.75
EINECS:231-843-4
Product Categories:26: Fe;Beaded Materials;Crystal Grade Inorganics;Iron;Iron Salts;Materials Science;Inorganics;metal halide;Metal and Ceramic Science;Salts;Catalysis and Inorganic Chemistry;Chemical Synthesis;7758-94-3
Mol File:7758-94-3.mol
Ferrous chloride Structure
Ferrous chloride Chemical Properties
Melting point 677 °C (lit.)
Boiling point 1023°C
density 3.16 g/mL at 25 °C (lit.)
vapor pressure 0Pa at 20℃
Fp 1023°C
solubility H2O: soluble
form beads
Specific Gravity3.162
color Off-white
Water Solubility Soluble in water, alcohol and acetone. Slightly soluble in benzene. Insoluble in ether.
Sensitive Hygroscopic
Merck 14,4043
Exposure limitsACGIH: TWA 1 mg/m3
NIOSH: TWA 1 mg/m3
InChIKeyNMCUIPGRVMDVDB-UHFFFAOYSA-L
CAS DataBase Reference7758-94-3(CAS DataBase Reference)
NIST Chemistry ReferenceIron dichloride(7758-94-3)
EPA Substance Registry SystemFerrous chloride (7758-94-3)
Safety Information
Hazard Codes C
Risk Statements 22-34
Safety Statements 26-36/37/39-45
RIDADR UN 3260 8/PG 3
WGK Germany 1
RTECS NO5400000
3-10-23
TSCA Yes
HazardClass 8
PackingGroup III
HS Code 2827392000
Hazardous Substances Data7758-94-3(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ALFA English
Ferrous chloride Usage And Synthesis
Occurrence and UsesIron(II) chloride occurs in nature as the mineral lawrencite. Iron dichloride is used as a mordant for dyeing; and as a reducing agent. It also is used in pharmaceutical preparation; in sewage treatment; and in metallurgy.
Physical PropertiesWhite hexagonal crystal; hygroscopic; density 3.16g/cm3; melts at 677°C; vaporizes at 1,023°C; vapor pressure 20 torr at 737°C and 200 torr at 897°C; highly soluble in water, ethanol and acetone; slightly soluble in benzene. The dihydrate and tetrahydrate are greenish monoclinic crystals; densities 2.39 and 1.39 g/cm3, respectively; decomposing at 120 and 105°C, respectively; both the hydrates soluble in water.
PreparationIron(II) chloride is prepared by passing chlorine or hydrogen chloride gas over iron at red heat or 700°C:
Fe + 2HCl → FeCl2 + H2
Fe + Cl2 → FeCl2
It also may be produced by the reduction of iron(III) chloride with hydrogen or other reducing agents at elevated temperatures:
2FeCl3 + H2 → 2FeCl2 + 2HCl
The tetrahydrate is obtained by dissolving the metal in hydrochloric acid followed by crystallization at room temperature.
Fe + 2HCl + 4H2O → FeCl2•4H2O + H2
The tetrahydrate gradually loses water when heated above 105°C forming dihydrate, monohydrate and the anhydrous salt. At 220°C it loses all its water of crystallization.






Chemical PropertiesGreenish-white crystals. readily oxidized. Soluble in alcohol and water.
Chemical PropertiesFerrous chloride is a pale greenish salt-like crystal or power.
Physical propertiesWhite hexagonal crystal; hygroscopic; density 3.16g/cm3; melts at 677°C;vaporizes at 1,023°C; vapor pressure 20 torr at 737°C and 200 torr at 897°C;highly soluble in water, ethanol and acetone; slightly soluble in benzene. Thedihydrate and tetrahydrate are greenish monoclinic crystals; densities 2.39and 1.39 g/cm3, respectively; decomposing at 120 and 105°C, respectively;both the hydrates soluble in water.
UsesFerrous chloride (FeCl2) is used in pharmaceutical preparations, for sewage treatment, and as a mordant (which fixes dyes so that they will not run) in textiles.
UsesUsed in the synthesis of a novel cis-Fe(BPE5)2Cl2 (BPE5=1,2-diphospholanoethane) complex, which has potential application in many types of reactions such as intra- or intermolecular activation.1
UsesA paramagnetic solid.
DefinitionChEBI: Iron dichloride is an iron coordination entity.
PreparationIron(II) chloride is prepared by passing chlorine or hydrogen chloride gasover iron at red heat or 700°C:
Fe + 2HCl → FeCl2 + H2
Fe + Cl2 → FeCl2
It also may be produced by the reduction of iron(III) chloride with hydrogenor other reducing agents at elevated temperatures:
2FeCl3 + H2 → 2FeCl2 + 2HCl
The tetrahydrate is obtained by dissolving the metal in hydrochloric acidfollowed by crystallization at room temperature.
Fe + 2HCl + 4H2O → FeCl2•4H2O + H2
The tetrahydrate gradually loses water when heated above 105°C formingdihydrate, monohydrate and the anhydrous salt. At 220°C it loses all its waterof crystallization.


General DescriptionFerrous chloride is a greenish white crystalline solid. Ferrous chloride is soluble in water. Ferrous chloride is noncombustible. Ferrous chloride is used in sewage treatment, in dyeing of fabrics, and for many other uses.
Air & Water ReactionsWater soluble.
Reactivity ProfileAlkali metal hydroxides, acids, anhydrous chlorides of iron, tin, and aluminum, pure oxides of iron and aluminum, and metallic potassium are some of the catalysts that may cause ethylene oxide to rearrange and polymerize, liberating heat, [J. Soc. Chem. Ind. 68:179(1949)]. Explosions occur , although infrequently, from the combination of ethylene oxide and alcohols or mercaptans, [Chem. Eng. News 20:1318(1942)].
Health HazardInhalation of dust irritates nose and throat. Ingestion causes irritation of mouth and stomach. Dust irritates eyes and may cause skin irritation on prolonged contact.
Fire HazardSpecial Hazards of Combustion Products: Irritating hydrogen chloride fumes may form in fire.
Flammability and ExplosibilityNonflammable
Safety ProfilePoison by ingestion and intraperitoneal routes. Mutation data reported. Corrosive. Probably an irritant to the eyes, skin, and mucous membranes. Can react violently with ethylene oxide, K, Na. di%en heated to decomposition it emits toxic fumes of Cl-. See also CHLORIDES and IRON.
Potential ExposureIt is used in textile dyeing, metallurgy, the pharmaceutical industry and sewage treatment.
ShippingUN1759 Ferrous chloride, solid, Hazard class: 8; Labels: 8-Corrosive material. UN1760 Ferrous chloride, solution, Hazard class: 8; Labels: 8-Corrosive material.
Purification MethodsIt forms white hygroscopic rhombohedral crystals with a green tint which oxidise in air to FeCl3 and Fe2O3. It is soluble in H2O, EtOH Me2CO but insoluble in Et2O. The tetrahydrate is pale green to pale blue in colour and loses 2H2O at 105-115o. The dihydrate loses H2O at 120o. [Anhydrous FeBr2 can be obtained by carefully dehydrating the tetrahydrate in a stream of HBr and N2, and it can be sublimed under N2.] The ferrous iron in aqueous solutions of these salts readily oxidises to ferric iron. (See above.) [Kovacuumic & Brace Inorg Synth VI 172 1960, Lux in Handbook of Preparative Inorganic Chemistry (Ed Brauer) Academic Press Vol II p 1491 1965.]
IncompatibilitiesSolution attacks metals. Contact with ethylene oxide may initiate polymerization. Contact with potassium or sodium forms an impact-sensitive material.
Methylene Chloride IRON(II) CHLORIDE N-HYDRATE ANHYDROUS FERRIC CHLORIDE Ferrous fumarate Iron(II) chloride tetrahydrofuran complex Ferrous chloride Ferric chloride Hematite Polyferric chloride IRON(II) CHLORIDE N-HYDRATE FERROUS SULFATE Ferrous sulfate monohydrate Cobalt chloride Ferrous 2-​[[(2-​ethylphenyl)​(2-​hydroxyethyl)​amino]​methyl]​-​3,​3-​difluoro-Propanenitrile CAST IRON [1,2-bis(diphenylphosphino)ethane]iron(II) chloride DUCTILE IRON

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