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 ...
Names | |
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IUPAC name
Iron(III) oxide-hydroxide | |
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Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.039.754 ![]() |
EC Number |
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MeSH | Goethite |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
FeO(OH) | |
Appearance | Vivid, dark orange, opaque crystals |
Odor | odorless |
Density | 4.25 g/cm3 |
insoluble at pH 7 | |
Solubility product (Ksp) |
2.79×10−39 for Fe(OH)3[1] |
Hazards | |
NFPA 704 (fire diamond) | |
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]