Cobalt (III) oxide
Crystal structure | ||||||||||
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__ Co 3+ __ O 2− | ||||||||||
General | ||||||||||
Surname | Cobalt (III) oxide | |||||||||
other names |
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Ratio formula | Co 2 O 3 | |||||||||
Brief description |
gray-black solid |
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properties | ||||||||||
Molar mass | 165.86 g mol −1 | |||||||||
Physical state |
firmly |
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density |
5.7 g cm −3 |
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Melting point |
895 ° C (decomposition) |
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solubility |
practically insoluble in water (0.84 mg l −1 at 37 ° C) |
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safety instructions | ||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Cobalt (III) oxide is a chemical compound from the group of oxides of cobalt . The pure form of this compound is not yet known.
Extraction and presentation
Exposure to air, but more quickly with oxidizing agents such as chlorine , bromine or hydrogen peroxide , creates brown cobalt (III) oxide hydrate Co 2 O 3 · nH 2 O in a basic solution of cobalt (II) hydroxide . Cobalt (III) hydroxide leaves Anhydrous cobalt (III) oxide can only be obtained via cobalt hydroxide oxide CoO (OH) under special conditions , although oxygen splitting off and thus the formation of other cobalt oxides such as Co 3 O 4 begins before complete dehydration .
properties
Cobalt (III) oxide is a gray-black solid that is practically insoluble in water. At a temperature above 895 ° C, it splits off oxygen, forming cobalt oxides such as Co 3 O 4 and CoO.
use
Cobalt (III) oxide as well as the blue cobalt (II) carbonate for the dyeing of glass , porcelain and enamel used.
Individual evidence
- ↑ a b c d e f g Entry on cobalt (III) oxide in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1686.
- ↑ Erwin Riedel, Christoph Janiak: Inorganic Chemistry . de Gruyter, 2011, ISBN 978-3-11-022566-2 ( page 860 in the Google book search).
- ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1554.
- ^ Karl-Heinz Lautenschläger, Werner Schröter: Taschenbuch der Chemie. 20th edition, Harri Deutsch Verlag, 2007, ISBN 978-3-8171-1761-1 , p. 379 ( limited preview in Google book search).