Hydrous ferric oxide (HFO) / From Wikipedia, the free encyclopedia
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Iron(III) oxide-hydroxide or ferric oxyhydroxide is the chemical compound of iron, oxygen, and hydrogen with formula FeO(OH).
Hydrous ferric oxide (HFO)
3D model (JSmol)
CompTox Dashboard (EPA)
|Appearance||Vivid, dark orange, opaque crystals|
|insoluble at pH 7|
Solubility product (Ksp)
|2.79×10−39 for Fe(OH)3|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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, hydrated iron oxide, yellow iron oxide, or Pigment Yellow 42.