Cobalt(III) oxide

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Cobalt(III) oxide[1]
Cobalt(III) oxide.JPG
IUPAC name
cobalt(III) oxide, dicobalt trioxide
Other names
cobaltic oxide, cobalt sesquioxide
3D model (JSmol)
ECHA InfoCard 100.013.779
EC Number
  • 215-156-7
RTECS number
  • GG2900000
Molar mass 165.8646 g/mol
Appearance red powder
Density 5.18 g/cm3 [2]
Melting point 895[3] °C (1,643 °F; 1,168 K)
+4560.0·10−6 cm3/mol
Trigonal, hR30
R-3c, No. 167
-577 kJ/mol
Main hazards toxic
R-phrases (outdated) R22 R40 R43
S-phrases (outdated) S36/37
NFPA 704
Flammability code 0: Will not burn. E.g. waterHealth code 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Cobalt (III) oxide is the inorganic compound with the formula of Co2O3. Although only two oxides of cobalt are well characterized, CoO and Co3O4,[4] 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.[5] Some formulations of the catalyst hopcalite contain "Co2O3".

See also[edit]


  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. ^
  4. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  5. ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.