Cobalt(III) oxide
_oxide.JPG)
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| Names | |
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| IUPAC name
cobalt(III) oxide, dicobalt trioxide
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| Other names
cobaltic oxide, cobalt sesquioxide
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| Identifiers | |
3D model (JSmol)
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| ECHA InfoCard | 100.013.779 |
| EC Number |
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PubChem CID
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| RTECS number |
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CompTox Dashboard (EPA)
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| Properties | |
| Co2O3 | |
| 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) |
| negligible | |
| Structure | |
| Trigonal, hR30 | |
| R-3c, No. 167 | |
| Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
-577 kJ/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
References
- ^ Sigma-Aldrich product page
- ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
- ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- ^ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.