Names | |
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IUPAC name
Iron(II) hydroxide
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Other names
Ferrous hydroxide, green rust
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.038.581 |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Fe(OH)2 | |
Molar mass | 89.86 g/mol |
Appearance | green solid |
Density | 3.4 g/cm3 [1] |
0.000052 g/100 g water (20 °C, pH 7)[2] | |
Solubility product (Ksp)
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8.0 x 10−16[3] |
Acidity (pKa) | 17[4] |
Hazards | |
Flash point | Non-flammable |
Related compounds | |
Related compounds
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Iron(II) oxide Iron(III) hydroxide |
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 (II) hydroxide or ferrous hydroxide is an inorganic compound with the formula Fe(OH)2. It is produced when iron (II) salts, from a compound such as iron(II) sulfate, are treated with hydroxide ions. Iron(II) hydroxide is a white solid, but even traces of oxygen impart a greenish tinge. The air-oxidised solid is sometimes known as "green rust".