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Properties of Fe(OH)2

Properties of Fe(OH)2 (Iron(II) hydroxide):

Compound NameIron(II) hydroxide
Chemical FormulaFe(OH)2
Molar Mass89.85968 g/mol

Chemical structure
Fe(OH)2 (Iron(II) hydroxide) - Chemical structure
Lewis structure
3D molecular structure
Physical properties
Appearancegreen solid
Solubility0.00052 g/100mL
Density3.4000 g/cm³
Helium 0.0001786
Iridium 22.562

Alternative Names

Ferrous hydroxide, green rust

Elemental composition of Fe(OH)2
ElementSymbolAtomic weightAtomsMass percent
IronFe55.845162.1469
OxygenO15.9994235.6097
HydrogenH1.0079422.2434
Mass Percent CompositionAtomic Percent Composition
Fe: 62.15%O: 35.61%H: 2.24%
Fe Iron (62.15%)
O Oxygen (35.61%)
H Hydrogen (2.24%)
Fe: 20.00%O: 40.00%H: 40.00%
Fe Iron (20.00%)
O Oxygen (40.00%)
H Hydrogen (40.00%)
Mass Percent Composition
Fe: 62.15%O: 35.61%H: 2.24%
Fe Iron (62.15%)
O Oxygen (35.61%)
H Hydrogen (2.24%)
Atomic Percent Composition
Fe: 20.00%O: 40.00%H: 40.00%
Fe Iron (20.00%)
O Oxygen (40.00%)
H Hydrogen (40.00%)
Identifiers
CAS Number18624-44-7
SMILESO[Fe]O
Hill formulaH2FeO2

Related compounds
FormulaCompound name
FeO(OH)Iron(III) oxide-hydroxide
Fe(OH)3Iron(III) hydroxide

Sample reactions for Fe(OH)2
EquationReaction type
Fe(OH)2 + O2 + H2O = Fe(OH)3synthesis
Fe(OH)2 + H2O2 = Fe(OH)3synthesis
Fe(OH)2 + H3PO4 = Fe3(PO4)2 + H2Odouble replacement
Fe(OH)2 + HCl = FeCl2 + H2Odouble replacement
Fe(OH)2 = FeO + H2Odecomposition

Related
Molecular weight calculator
Oxidation state calculator

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