1308-04-9

Usage

Uses

Different sources of media describe the Uses of 1308-04-9 differently. You can refer to the following data:
1. COBALT(III) OXIDE BLACK is used as a pigment; for glazing porcelain and pottery; and for coloring enamels.
2. Cobaltic 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.
3. Pigment, coloring enamels, glazing pottery.

Preparation

Different sources of media describe the Preparation of 1308-04-9 differently. You can refer to the following data:
1. COBALT(III) OXIDE BLACK is prepared by heating cobalt compounds at low temperatures in air.
2. Cobalt(III) oxide 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

Chemical Properties

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

Physical properties

Grayish black powder; density 5.18 g/cm3; decomposes at 895°C; insoluble in water; soluble in concentrated mineral acids.

Definition

Sometimes incorrectly called cobalt peroxide.

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.