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ChemicalBook--->CAS DataBase List--->1308-04-9

1308-04-9

1308-04-9 Structure

1308-04-9 Structure
IdentificationBack Directory
[Name]

COBALT(III) OXIDE BLACK
[CAS]

1308-04-9
[Synonyms]

c.i.77323
COBALT BLACK
dicobaltoxide
cobalttrioxide
Cobolt-3-oxide
Cobalt(Ⅲ)oxide
COBALTIC OXIDE
cobaltperoxide
cobalt(3+)oxide
cobalitic oxide
Cabalt trioxide
Cobalt(Ⅱ,Ⅲ)oxide
dicobalttrioxide
cobalt(iii)oxide
cobaltsesqioxide
COBALT(2,3) OXIDE
COBALT TETRAOXIDE
BLACK COBALT OXIDE
COBALT SESQUIOXIDE
COBALT OXIDE, GRAY
COBALT(+2,+3)OXIDE
cobaltoxide(co2o3)
BLACKCOBALTICOXIDE
COBALTIC TETRAOXIDE
COBALT(II,III) OXIDE
COBALT(III) OXIDE BL
COBALT(III) OXIDE BLACK
Cobaltic oxide monohydrate
COBALT(II)-COBALT(III)-OXIDE
COBALT(III) OXIDE BLACK, PURE
COBALT(III) OXIDE R. G., FOR THE DETERMI NATION OF SULFUR
[EINECS(EC#)]

215-157-2
[Molecular Formula]

Co2O3
[MDL Number]

MFCD00036266
[MOL File]

1308-04-9.mol
[Molecular Weight]

165.86
Chemical PropertiesBack Directory
[Definition]

Sometimes incorrectly called cobalt peroxide.
[Appearance]

Steel-gray or black powder.Soluble in concentrated acids; insoluble in water.
[Melting point ]

895 °C (dec.)(lit.)
[density ]

6.11 g/mL at 25 °C(lit.)
[storage temp. ]

Inert atmosphere,Room Temperature
[solubility ]

insoluble in H2O; soluble in concentrated acid solutions
[form ]

powder
[color ]

gray-black
[Water Solubility ]

insoluble H2O; soluble conc acids [HAW93]
[Uses]

Pigment, coloring enamels, glazing pottery.
[EPA Substance Registry System]

Cobalt oxide (Co2O3) (1308-04-9)
Hazard InformationBack Directory
[Chemical Properties]

Steel-gray or black powder.Soluble in concentrated acids; insoluble in water.
[Description]

Neither the oxide Co2O3 nor the hydroxide Co(OH)3 is definitely established. The oxidation of cobalt(II) hydroxide in aqueous suspension with, for example, peroxides, or the destruction of a cobalt(III) complex with alkali gives a brown or black powder Co2O3.aq which upon drying at 150° yields the monohydrate Co2O3.H2O; this is probably best formulated as CoO(OH). When heated further in attempts to dehydrate it, the "monohydrate" begins to evolve oxygen (as well as water) at 300° with the formation of black Co3O4. When heated to 100° in air cobalt(II) hydroxide is converted to dark brown CoO(OH).
[Physical properties]

Grayish black powder; density 5.18 g/cm3; decomposes at 895°C; insoluble in water; soluble in concentrated mineral acids.
Safety DataBack Directory
[Hazard Codes ]

Xn
[Risk Statements ]

36/37/38-40-43-22
[Safety Statements ]

26-36/37/39-36/37
[WGK Germany ]

1
[RTECS ]

GG2500000
[Safety Profile]

: Moderately toxic by intraperitoneal and subcutaneous routes. Questionable carcinogen. Violent reaction with hydrogen peroxide. The oxide increases the sensitivity of nitroalkanes (e.g., nitromethane, nitroethane, and 1 nitropropane) to heat or detonation. See also COBALT COMPOUNDS.
[Toxicity]

mouse,LD50,subcutaneous,2064mg/kg (2064mg/kg),Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva im. D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. Vol. 19, Pg. 186, 1974.
Raw materials And Preparation ProductsBack Directory
[Raw materials]

Nitric acid-->Ammonium bicarbonate-->Cobalt
[Preparation Products]

Potassium dichromate-->Aluminum hydroxide-->Tartrazine-->Aluminium potassium sulfate dodecahydrate-->Aluminum ammonium sulfate-->Fosetyl aluminum-->Lead chromate-->CI NO 77605-->Aluminum Stearate-->Fast Malachite Blue lake-->Repair the lear
Questions And AnswerBack Directory
[Uses]

COBALT(III) OXIDE BLACK is used as a pigment; for glazing porcelain and pottery; and for coloring enamels.
[Preparation]

COBALT(III) OXIDE BLACK is prepared by heating cobalt compounds at low temperatures in air.
[Reactions]

Heating with hydrogen, carbon or carbon monoxide reduces the oxide to cobalt metal.
Co2O3 + 3H2→ 2Co + 3H2O
Co2O3 + 3CO→ 2Co + 3CO
2Co2O3 + 3C→ 4Co + 3CO2
Strong heating in air converts cobalt(III) oxide to tricobalt tetroxide.
Reactions with mineral acids produce their Co3+ salts:
Co2O3 + 6HCl → 2CoCl3 + 3H2O
Spectrum DetailBack Directory
[Spectrum Detail]

COBALT(III) OXIDE BLACK(1308-04-9)IR1
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