Iron oxide - Fe2O3

What is Iron oxide?

Iron oxide is also called ferric oxide is an inorganic compound with the chemical formula Fe2O3. It occurs in nature very abundantly and widely distributed. It is a chemical complexes which occur naturally comprising of iron and oxygen. Iron oxide are vital to humans and useful in most geological and biological activities. This iron oxide may be required for investigations of their own particular properties or used as starting materials for other processes.

Other name – Ferric oxide, Iron(III) oxide, Ferric oxide red


Iron oxide


5.24 g/cm³

Molecular Weight/ Molar Mass

159.69 g/mol

Boiling Point

3,414 °C

Melting Point

1,565 °C

Chemical Formula


Iron oxide Structure – Fe2O3

Iron oxide

Physical Properties of Iron oxide – Fe2O3




Red-brown solid

Covalently-Bonded Unit


Hydrogen Bond Donor


Oxidation state



Insoluble in water, soluble in strong acid

Chemical Properties of Iron oxide – Fe2O3

  • Iron oxide reacts with water to produce iron hydroxide.
  • Fe2O3 + H2O → Fe(OH)3

  • Iron(III) oxide react with sulfuric acid to produce iron(III) sulfate and water.
  • Fe2O3 + H2SO4 → Fe2(SO4)3 + H2O

Uses of Iron oxide – Fe2O3

  • The ordinary black iron oxide has been used in both copperplate and die stamping inks.
  • Oxides of iron constitute the main component of products in the pharmaceutical industry, paint industry, plastic industry, ink industry and cosmetic industry.
  • Used as a pigment of natural origin inclusive titanium dioxide.
  • Its salt are used as a flocculant in wastewater treatment the dyeing of textiles and the production of fertilizer and feed additives.
  • Used as a polishing material in the jewellery trade.

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