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Names | |||
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IUPAC names
Iron(III) chloride
Iron trichloride | |||
Other names
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Identifiers | |||
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3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.028.846 | ||
EC Number |
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PubChem CID
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RTECS number |
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UNII |
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UN number |
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CompTox Dashboard (EPA)
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Properties | |||
FeCl3 | |||
Molar mass |
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Appearance | Green-black by reflected light; purple-red by transmitted light; yellow solid as hexahydrate; brown as aqueous solution | ||
Odor | Slight HCl | ||
Density |
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Melting point | 307.6 °C (585.7 °F; 580.8 K) (anhydrous) 37 °C (99 °F; 310 K) (hexahydrate)[1] | ||
Boiling point |
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912 g/L (anhydrous or hexahydrate, 25 °C)[1] | |||
Solubility in |
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+13,450·10−6 cm3/mol[2] | |||
Viscosity | 12 cP (40% solution) | ||
Hazards[4][5][Note 1] | |||
GHS labelling: | |||
![]() ![]() | |||
Danger | |||
H290, H302, H314 | |||
P234, P260, P264, P270, P273, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P390, P405, P406, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | Non-flammable | ||
NIOSH (US health exposure limits): | |||
REL (Recommended)
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TWA 1 mg/m3[3] | ||
Safety data sheet (SDS) | ICSC | ||
Related compounds | |||
Other anions
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Other cations
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Related coagulants
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Structure | |||
Hexagonal, hR24 | |||
R3, No. 148[7] | |||
a = 0.6065 nm, b = 0.6065 nm, c = 1.742 nm α = 90°, β = 90°, γ = 120°
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Formula units (Z)
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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 describes the inorganic compounds with the formula FeCl3(H2O)x. Also called ferric chloride, 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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