Cobalt(III) oxide is the
inorganic compound
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...
with the formula of Co
2O
3. Although only two oxides of cobalt are well characterized,
CoO
COO or coo may refer to:
Business
* Certificate of origin, used in international trade
* Chief operating officer or chief operations officer, high-ranking corporate official
* Concept of operations, used in Systems Engineering Management Process
...
and
Co3O4, procedures claiming to give Co
2O
3 have been described. Thus treatment of Co(II) salts such as
cobalt(II) sulfate
Cobalt(II) sulfate is any of the inorganic compounds with the formula CoSO4(H2O)x. Usually cobalt sulfate refers to the hexa- or heptahydrates CoSO4.6H2O or CoSO4.7H2O, respectively. The heptahydrate is a red solid that is soluble in water and ...
with an aqueous solution of
sodium hypochlorite
Sodium hypochlorite (commonly known in a dilute solution as bleach) is an Inorganic chemistry, inorganic chemical compound with the chemical formula, formula NaOCl (or NaClO), comprising a sodium cation () and a hypochlorite anion (or ). It may ...
(also known as bleach) gives a black solid:
:2CoSO
4 + 4NaOH + NaOCl → Co
2O
3 + 2Na
2SO
4 + NaCl
Some formulations of the catalyst
hopcalite
Hopcalite is the trade name for a number of mixtures that mainly consist of oxides of copper and manganese, which are used as catalysts for the conversion of carbon monoxide to carbon dioxide when exposed to the oxygen in the air at room temperatu ...
contain "Co
2O
3".
Some studies have been unable to synthesize the compound, and report that it is theoretically unstable.
It is soluble in cold diluted
sulfuric acid
Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid ( Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with the molecular formu ...
and produces Co
2 4">O4sub>3, which is blue in aqueous solution.
: Co
2O
3 + 3H
2SO
4 → Co
2 4">O4sub>3 + 3H
2O
Colbalt(III) ion is a strong
oxidizer
An oxidizing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) is a substance in a redox chemical reaction that gains or " accepts"/"receives" an electron from a (called the , , or ). In other words, an oxid ...
in acidic solution, its
standard electrode potential
In electrochemistry, standard electrode potential E^\ominus, or E^\ominus_, is a measure of the reducing power of any element or compound. The IUPAC "Gold Book" defines it as: ''"the value of the standard emf (electromotive force) of a cell in wh ...
is +1.84V in this situation.
See also
*
Cobalt Oxide Nanoparticles
In materials and electric battery research, cobalt oxide nanoparticles usually refers to particles of cobalt(II,III) oxide of nanometer size, with various shapes and crystal structures.
Cobalt oxide nanoparticles have potential applications in li ...
References
{{oxygen compounds
Cobalt(III) compounds
Sesquioxides
Transition metal oxides