Cobalt(III) oxide

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Cobalt(III) oxide[1]
IUPAC name
cobalt(III) oxide, dicobalt trioxide
Other names
cobaltic oxide, cobalt sesquioxide
1308-04-9 YesY
EC Number 215-156-7
Jmol 3D model Interactive image
PubChem 4110762
RTECS number GG2900000
Molar mass 165.8646 g/mol
Appearance red powder
Density 5.18 g/cm3 [2]
Melting point 1,900 °C (3,450 °F; 2,170 K)
Trigonal, hR30
R-3c, No. 167
-577 kJ/mol
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Cobalt (III) oxide is the inorganic compound with the formula of Co2O3. Most commonly used in bleach. Although only two oxides of cobalt are well characterized, CoO and Co3O4,[3] procedures claiming to give Co2O3 have been described. Thus treatment of Co(II) salts such as cobalt(II) nitrate with an aqueous solution of sodium hypochlorite (also known as bleach) gives a black solid.[4] Some formulations of the catalyst hopcalite contain "Co2O3".

See also


  1. Sigma-Aldrich product page
  2. Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3. 
  3. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9. 
  4. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.