Ferric oxide, likewise called by its IUPAC name iron Trihydrate or iron(III) oxide, is an not natural compound stood for by the chemical formula Fe2O3 or Fe2H6O3 <1, 2>. It is one of the most necessary oxides that iron, the other two gift ferrosoferric oxide (Fe3O4) and ferrous oxide (FeO) respectively <3, 4>. It naturally occurs as the mineral hematite <1>.

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Ferric Oxide Identification

CAS Number1309-37-1 <2>
PubChem CID56841934 <2>
ChemSpider ID452497 <1>
ChEBICHEBI:50819 <5>
EC Number616-935-8 <2>
RTECS NumberNO7400000 <6>


Ferric Oxide Formula

Hydrated Ferric Oxide

It is a reddish-brown gelatinous compound created upon enhancement of alkali to services containing Fe(III) salts. The is additionally called hydrous ferric oxide and can be chemically stood for either together Fe2O3.H2O or Fe(O)OH <12>. Some usual forms of the hydrated ferric oxide encompass red lepidocrocite that occurs externally in rusticles and also orange goethite the occurs on the within of rusticles.

How is Ferric Oxide prepared

Ferric oxide is synthesized in the laboratory with electrolysis of salt bicarbonate solution, which acts together an inert electrolyte, and also an iron anode. The electrolytic counter of iron into hydrated iron (III) oxide is stood for as:

4Fe + 3O2 + 2H2O → 4 FeO(OH)

The hydrated iron (III) oxide, thus produced, experience dehydration at approximately 200 °C to kind ferric oxide <7>.

2 FeO(OH) → Fe2O3 + H2O


Ferric steel Oxide Powder

Chemical reaction with various other Compounds

Oxidation that Ferrous Sulfate come Ferric Sulfate

It requires oxidation the ferrous disulfide (FeS2) to ferrous sulfate (FeSO4), i beg your pardon is more oxidized come ferric sulfate <13>:

FeS2 + 7O+ H2O → FeSO4 + H2SO42FeSO4 + H2SO4 + O → Fe2(SO4)3 + H2O

Aluminum replace instead instead Iron native Ferric Oxide

Aluminum and also ferric oxide undergo a oxidization reaction whereby the steel replaces steel to kind aluminum oxide:

Fe2O3 + 2Al → Al2O3 + 2Fe

Properties and also Characteristics that Ferric Oxide

General Properties

Molar Mass/Molecular Weight159.68820 g/mol <1, 5>

Physical Properties

Color and AppearanceReddish-brown powder <1, 8>
Melting Point1538-1566 °C, 2800-2850 °F <8, 9>
Boiling PointN/A <8>
Density5.24 g cm-3 <8>
State of matter at room temperature (solid/liquid/gas)Solid <1>
SolubilitySoluble in heat HCl, slightly soluble in H2SO4 <9>
Solubility in WaterInsoluble <9>
Magnetic Susceptibility (χ)3.586 X 10-3 emu/Oe.g <10>
Heat Capacity103.9 J/mol.K

Atomic Properties

Crystal StructureRhombohedral (α form), cubic (β and γ forms), orthorhombic (ε form) <11>


Structure the Ferric Oxide


In iron markets for producing steel and also alloys <9>.Ferric oxide powder, also called jeweler’s rouge, is offered for sprucing up lenses and metallic jewel <14>.Its granular form is supplied as a filtration media because that pulling the end phosphates in saltwater aquariums <14>.As FDA-approved colours Brown 6 and also Pigment Red 101, for use in cosmetics <14>.In biomedical applications, due to the fact that its nanoparticles room non-toxic and biocompatible <14>.

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Is that Dangerous

Prolonged exposure to its fume or dust can an outcome in pneumoconiosis v fever, chills, aches, shortness of breath, and cough <15>. Repeated contact with eyes can discolor it and also cause permanent iron staining <15>.