ChemicalBook Product Catalog Inorganic chemistry Oxides and peroxides Metal oxide COBALT(III) OXIDE BLACK

COBALT(III) OXIDE BLACK

COBALT(III) OXIDE BLACK Basic information
Uses Preparation Reactions
Product Name:COBALT(III) OXIDE BLACK
Synonyms:dicobalttrioxide;Cabalt trioxide;COBALT(III) OXIDE R. G., FOR THE DETERMI NATION OF SULFUR;COBALT(III) OXIDE BLACK, PURE;Cobalt(Ⅱ，Ⅲ）oxide;Cobaltic oxide monohydrate;BLACKCOBALTICOXIDE;cobalt(iii)oxide
CAS:1308-04-9
MF:Co2O3
MW:165.86
EINECS:215-156-7
Product Categories:Inorganics
Mol File:1308-04-9.mol
COBALT(III) OXIDE BLACK Structure
COBALT(III) OXIDE BLACK Chemical Properties
Melting point 895 °C (dec.)(lit.)
density 6.11 g/mL at 25 °C(lit.)
storage temp. Inert atmosphere,Room Temperature
form powder
Water Solubility insoluble H2O; soluble conc acids [HAW93]
EPA Substance Registry SystemCobalt oxide (Co2O3) (1308-04-9)
Safety Information
Hazard Codes Xn
Risk Statements 36/37/38-40-43-22
Safety Statements 26-36/37/39-36/37
WGK Germany 1
RTECS GG2500000
Toxicitymouse,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.
MSDS Information
ProviderLanguage
SigmaAldrich English
ALFA English
COBALT(III) OXIDE BLACK Usage And Synthesis
UsesCOBALT(III) OXIDE BLACK is used as a pigment; for glazing porcelain and pottery; and for coloring enamels.
PreparationCOBALT(III) OXIDE BLACK is prepared by heating cobalt compounds at low temperatures in air.
ReactionsHeating 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





DescriptionNeither 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).
Chemical PropertiesSteel-gray or black powder.Soluble in concentrated acids; insoluble in water.
Physical propertiesGrayish black powder; density 5.18 g/cm3; decomposes at 895°C; insoluble in water; soluble in concentrated mineral acids.
UsesCobaltic oxide (Co2O3) is also known as cobalt oxide or cobalt black. It is dark gray to black and is used in pigments, ceramic glazes, and semiconductors.
UsesPigment, coloring enamels, glazing pottery.
DefinitionSometimes incorrectly called cobalt peroxide.
PreparationCobalt(III) oxide is prepared by heating cobalt compounds at low temperatures in air.
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.
Holmium Oxide Gallium(III) oxide Zirconium dioxide Molybdenum(IV) oxide Diantimony trioxide Cerium dioxide Nickel oxide Sulfur trioxide Barium oxide Potassium chromate FERROUS SULFATE Chromium(III) oxide Magnesium oxide cobalt hydroxide oxide COBALT(III) OXIDE BLACK COBALT(III) OXIDE BLACK Cobalt oxide Cobalt
Email:[email protected] [email protected]
Copyright © 2024 Mywellwork.com All rights reserved.