Catalog Number
ACMA00014315
Product Name
Chromium(III) Oxide
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 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
Covalently-Bonded Unit Count
1
EC Number
215-160-9;606-354-8
Exact Mass
151.865754g/mol
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
Stability
Stable under recommended storage conditions.
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