Chromium(III) Oxide - Materials / Alfa Chemistry

NAVIGATION

Chromium(III) Oxide

PRICE INQUIRY

Catalog Number

ACMA00014315

Product Name

Chromium(III) Oxide

Category

Glass Additives; Polymers

Description

DryPowder; DryPowder, PelletsLargeCrystals; Liquid; OtherSolid; OtherSolid, Liquid; PelletsLargeCrystals; PelletsLargeCrystals, OtherSolid;LIGHT-TO-DARK-GREEN POWDER.

IUPAC Name

oxo(oxochromiooxy)chromium

Molecular Weight

151.99g/mol

Molecular Formula

Cr2O3;Cr2O3;Cr2O3

Canonical SMILES

O=[Cr]O[Cr]=O

InChI

InChI=1S/2Cr.3O

InChI Key

QDOXWKRWXJOMAK-UHFFFAOYSA-N

Boiling Point

4000 °C;4000 °C

Melting Point

2435 °C;2435 °C

Density

5.22 at 25 °C;5.22 g/cm³

Solubility

In water, 3.13 ug/L at 20 °C, pH 6; 2.96 ug/L at 20 °C, pH 8;Practically insoluble in water;Practically insoluble in alcohol, acetone; slightly soluble in acids, alkalies;Insoluble in acids, and alkalies;Solubility in water: none

Color/Form

Light to dark green, fine, hexagonal crystals;Green powder;Bright-green, extremely hard crystals

Complexity

34.2

Covalently-Bonded Unit Count

EC Number

215-160-9;606-354-8

Exact Mass

151.865754g/mol

Formal Charge

Heavy Atom Count

ICSC Number

1531

MeSH Entry Terms

chromic oxide;chromium (3+) oxide;chromium (III) oxide;chromium oxide hydrate;chromium oxide tetrahydrate;chromium oxide, 51Cr-labeled;chromium sesquioxide;chromium(III) oxide;dichromium trioxide

Monoisotopic Mass

151.865754g/mol

Other Experimental

Turns brown on heating, but reverts to green color on cooling. Crystalline chromic oxide is extremely hard; will scratch quartz, topaz, zircon.;In water, 10.3 ug/L at 20 °C /Chromium oxide hydrate/;Electrical resistivity: 1.3x10+9, 2.3x10+7, 6.8x10+3, and 4.5x10+3 microohm-cm at 350, 1200, 600, and 1100 °C, respectively.;Calculated lattice energy: 15,276 kJ/mol; thermochemical cycle lattice energy: 114,957 kJ/mol;Chromium forms a number of compounds in various oxidation states. Those of 2+ (chromous), 3+ (chromic) and 6+ (chromates) are the most important /Chromium, alloys and cmpd/;Chromium(III) compounds are reduced to Cr(II) compounds by hypophosphites, electrolysis, or reducing metals, such as zinc, magnesium, & aluminum in acid soln (although it should be noted that Cr(II) compounds are stable only in the absence of air). In basic solution, Cr(III) is readily oxidized to chromium oxide (CrO4(-2)) by hypochlorite, hypobromite, peroxide, & oxygen under pressure at high temperature. In acid solution, Cr(III) is difficult to oxidize & needs strong oxidizing agents, such as concentrated perchloric acid, sodium bismuthate, & permanganate. /Trivalent chromium/;Cr(III) is the most stable oxidation state of chromium & is always present as a coordination complex /Trivalent chromium/;Slightly soluble in water. /Trivalent chromium/

Refractive Index

Index of refraction: 2.551

Rotatable Bond Count

RTECS Number

GB6475000

Stability

Stable under recommended storage conditions.

UN Number

3077

MSDS

Download MSDS

COA