Cobalt(III) oxide
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| Template:Longitem | Co2O3 |
| Molar mass | 165.8646 g/mol |
| Appearance | red powder |
| Density | 5.18 g/cm3 [2] |
| Melting point | Template:Chembox CalcTemperatures |
| Template:Longitem | +4560.0·10−6 cm3/mol |
| Template:Longitem | Corundum, hR30 |
| Template:Longitem | R3c, No. 167 |
| Template:Longitem | −577 kJ/mol |
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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) sulfate with an aqueous solution of sodium hypochlorite (also known as bleach) gives a black solid:[5][6]
- 2CoSO4 + 4NaOH + NaOCl → Co2O3 + 2Na2SO4 + NaCl
Some formulations of the catalyst hopcalite contain "Co2O3".
Some studies have been unable to synthesize the compound, and report that it is theoretically unstable.[7]
It is soluble in cold diluted sulfuric acid and produces Co2[SO4]3, which is blue in aqueous solution.
- Co2O3 + 3H2SO4 → Co2[SO4]3 + 3H2O
Cobalt(III) ion is a strong oxidizer in acidic solution, its standard electrode potential is +1.84V in this situation.[8]
See also
References
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- ↑ Sigma-Aldrich product page
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- ↑ Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1675.
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