Cobalt(II,III) oxide

Template:Chembox header | Cobalt(II) oxide
Cobalt(II,III) oxide
Template:Chembox header | General
Systematic name	Cobalt(II,III) Oxide
Other names	Cobalto-Cobaltic Oxide, Tricobalt Tetraoxide, tricobalt tetroxide
Molecular formula	Co3O4
Molar mass	240.80 g/mol
Appearance	A gray, green, red, or black powder
CAS number	1308-06-1
Template:Chembox header | Properties
Density and phase	6.1 g/cm3
Solubility in water	practically insoluble in water
Melting point	895°C (1168 K)
Boiling point	?°C (? K)
Template:Chembox header | Hazards
MSDS	(Use CAS#) Fisher Scientific
Main hazards	Respiratory tract inflammation possibly carcinogenic
NFPA 704	Template:NFPA 704
R/S statement	R: 22 43 50-53 S: (2-)24-37-60-61
RTECS number	GG2500000
Template:Chembox header | Related compounds
Other anions	Cobalt(II) carbonate Cobalt(II) nitrate, Cobalt(II) chloride
Other cations	Iron(III) oxide, Iron(II) oxide Cobalt(II) oxide
Related compounds	Cobalt(III) oxide
Template:Chembox header | Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references

Summary

Cobalt(II,III) oxide is the most prevalent of cobalt's various oxides. The oxide is typically found in ores alongside containing nickel, arsenic, sulfur, and manganese. These ores can be found in great quantities in Canada, Southern Africa, and Morocco among other locales.

This oxide has a gunmetal gray appearance and is typically distributed in a powdered form.

Derivative Compounds

Reactions of Cobalt(II,III) oxide can yield other oxides with similar characteristics:

When heated in the presence of excess oxygen:

Co₃O_4(s) + O_2(g) → 3 Co₂O_3(s)

The reaction yields Cobalt(III) Oxide.

Health Issues

RTECS recognizes Cobalt(II,III) oxide as a tumorigen in oral LD50 trials with lethal doses of greater than 5g/kg per day in rats. This is characteristic with other oxides of cobalt