Iron(III) oxide-hydroxide

Hydrous ferric oxide (HFO) / From Wikipedia, the free encyclopedia

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Iron(III) oxide-hydroxide or ferric oxyhydroxide[2] is the chemical compound of iron, oxygen, and hydrogen with formula FeO(OH).

Quick facts: Names, Identifiers, Properties, Hazards, Phar... ▼
Iron(III) oxide-hydroxide
Samples of iron(III) oxide-hydroxide monohydrate in a vial, and a spoon
Names
IUPAC name
Iron(III) oxide-hydroxide
Other names
Metaferric acid
Ferric oxyhydroxide
Goethite
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.039.754 Edit this at Wikidata
EC Number
  • 215-176-6
MeSH Goethite
UNII
  • InChI=1S/Fe.H2O.O/h;1H2;/q+1;;/p-1 checkY
    Key: AEIXRCIKZIZYPM-UHFFFAOYSA-M checkY
  • O=[Fe]O
Properties
FeO(OH)
Appearance Vivid, dark orange, opaque crystals
Odor odorless
Density 4.25 g/cm3
insoluble at pH 7
2.79×10−39 for Fe(OH)3[1]
Hazards
NFPA 704 (fire diamond)
1
0
0
Pharmacology
B03AB04 (WHO)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The compound is often encountered as one of its hydrates, FeO(OH)·nH
2O [rust]. The monohydrate FeO(OH)·H
2O is often referred to as iron(III) hydroxide Fe(OH)
3,[3] hydrated iron oxide, yellow iron oxide, or Pigment Yellow 42.[3]