Iron(II) hydroxide

Iron(II) hydroxide
Names
	IUPAC name Iron(II) hydroxide
	Other names Ferrous hydroxide, green rust
Identifiers
CAS Number	18624-44-7 ;
3D model (JSmol)	Interactive image;
ChemSpider	8305416 ;
ECHA InfoCard	100.038.581
PubChem CID	10129897;
UNII	7JIM5W32UU ;
CompTox Dashboard (EPA)	DTXSID8066393 ;
	InChI InChI=1S/Fe.2H2O/h;21H2/q+2;;/p-2 Key: NCNCGGDMXMBVIA-UHFFFAOYSA-L ; InChI=1/Fe.2H2O/h;21H2/q+2;;/p-2 Key: NCNCGGDMXMBVIA-NUQVWONBAV;
	SMILES O[Fe]O;
Properties
Chemical formula	Fe(OH)2
Molar mass	89.86 g/mol
Appearance	green solid
Density	3.4 g/cm3
Solubility in water	0.000052 g/100 g water (20 °C, pH 7)
Solubility product (Ksp)	8.0 x 10−16
Acidity (pKa)	17
Hazards
Flash point	Non-flammable
Related compounds
Related compounds	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). verify (what is ?) Infobox references

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".

^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
^ CRC Handbook of Chemistry and Physics, 84th Edition, CRC Press, 2004, pg 4-62
^ Stumm, Werner; Lee, G. F. (February 1961). "Oxygenation of Ferrous Iron" (PDF). Industrial & Engineering Chemistry. 53 (2): 143–146. doi:10.1021/ie50614a030. Retrieved 17 November 2022.
^ Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2^nd ed.). Oxford: Pergamon (published 1984). Entry 130. ISBN 0-08-029214-3. LCCN 82-16524.

[1] Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.

[2] CRC Handbook of Chemistry and Physics, 84th Edition, CRC Press, 2004, pg 4-62

[3] Stumm, Werner; Lee, G. F. (February 1961). "Oxygenation of Ferrous Iron" (PDF). Industrial & Engineering Chemistry. 53 (2): 143–146. doi:10.1021/ie50614a030. Retrieved 17 November 2022.

[P82db-4] Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2^nd ed.). Oxford: Pergamon (published 1984). Entry 130. ISBN 0-08-029214-3. LCCN 82-16524.

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