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Iron(III) chloride

Iron(III) chloride
Names IUPAC names
Iron(III) chloride
Iron trichloride
Other names
  • Ferric chloride
  • Molysite
  • Flores martis
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard100.028.846EC Number
  • 231-729-4
RTECS number
  • LJ9100000
UNII
UN number
  • 1773 (anhydrous)
  • 2582 (aqueous solution)
  • InChI=1S/3ClH.Fe/h3*1H;/q;;;+3/p-3
    Key: RBTARNINKXHZNM-UHFFFAOYSA-K
  • InChI=1S/3ClH.Fe/h3*1H;/q;;;+3/p-3
    Key: RBTARNINKXHZNM-DFZHHIFOAF
  • Key: RBTARNINKXHZNM-UHFFFAOYSA-K
  • Cl[Fe](Cl)Cl
Properties FeCl3Molar mass
  • 162.204g/mol (anhydrous)
  • 270.295g/mol (hexahydrate)
Appearance Green-black by reflected light; purple-red by transmitted light; yellow solid as hexahydrate; brown as aqueous solution OdorSlight HClDensity
  • 2.90g/cm (anhydrous)
  • 1.82g/cm (hexahydrate)
Melting point307.6 °C (585.7 °F; 580.8 K) (anhydrous)
37 °C (99 °F; 310 K) (hexahydrate) Boiling point
  • 316 °C (601 °F; 589 K) (anhydrous, decomposes)
  • 280 °C (536 °F; 553 K) (hexahydrate, decomposes)
912g/L (anhydrous or hexahydrate, 25°C) Solubility in
  • 630 g/L (18 °C)
  • Highly soluble
  • 830 g/L
  • Highly soluble
+13,450·10cm/mol Viscosity12 cP (40% solution) Hazards GHS labelling: DangerH290, H302, H314P234, P260, P264, P270, P273, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P390, P405, P501NFPA 704 (fire diamond)
2
0
0
Flash pointNon-flammable NIOSH (US health exposure limits):
REL (Recommended)
TWA 1mg/m Safety data sheet (SDS) ICSC1499Related compounds
Other anions
Other cations
Related coagulants
Structure Hexagonal, hR24R3, No. 148
a = 0.6065nm, b = 0.6065nm, c = 1.742nm
α = 90°, β = 90°, γ = 120°
6 Octahedral
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Iron(III) chloride, also called ferric chloride, is an inorganic compound with the formula FeCl3. It forms hydrates FeCl3·xH2O. These compounds are some of the most important and commonplace compounds of iron. They are available both in anhydrous and in hydrated forms, which are both hygroscopic. They feature iron in its +3 oxidation state. The anhydrous derivative is a Lewis acid, while all forms are mild oxidizing agents. It is used as a water cleaner and as an etchant for metals.

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