1333-82-0

Product Name: Chromium(VI) oxide

Formula: CrO3

Synonyms: Chromic anhydride;Chromic anhydride, Chromium trioxide;Chromium(VI) oxide

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CHEMICAL AND PHYSICAL PROPERTIES SAFETY INFORMATION COMPUTED DESCRIPTORS PRODUCT INTRODUCTION RELATED SUPPLIERS

CHEMICAL AND PHYSICAL PROPERTIES

Physical Description	Chromium trioxide, anhydrous appears as a dark purplish red solid. Under prolonged exposure to fire or heat the containers may explode. Highly toxic. A confirmed human carcinogen.
Color/Form	Dark red, bipyramidal prismatic crystals, flakes or granular powder
Odor	Odorless
Boiling Point	482 °F at 760 mmHg (decomposes) (NTP, 1992)
Melting Point	385 °F (NTP, 1992)
Solubility	Very soluble (NTP, 1992)
Density	2.7 (NTP, 1992) - Denser than water; will sink
Vapor Pressure	Very low (NIOSH, 2023)
Stability/Shelf Life	Stable under recommended storage conditions.
Autoignition Temperature	May ignite organic materials on contact. (USCG, 1999)
Decomposition	Decomposes when heated to 250 °C, liberating oxygen to support combustion.
pH	Dissolves in water to form a weak acid
Other Experimental Properties	Chromium trioxide, CrO3, contains hexavalent chromium. Its molecular weight is 100.01. It is also known as red oxide of chromium, chromic anhydride, chromic acid anhydride and, erroneously, chromic acid.
Chemical Classes	Metals -> Chromium Compounds, Inorganic

SAFETY INFORMATION

Signal word	Danger
Pictogram(s)	Flame Over Circle Oxidizers GHS03 Corrosion Corrosives GHS05 Skull and Crossbones Acute Toxicity GHS06 Health Hazard GHS08 Environment GHS09
GHS Hazard Statements	H271:Oxidising liquids;Oxidising solids H314:Skin corrosion/irritation H317:Sensitisation, Skin H330:Acute toxicity,inhalation H334:Sensitisation, respiratory H335:Specific target organ toxicity, single exposure;Respiratory tract irritation H340:Germ cell mutagenicity H350:Carcinogenicity H372:Specific target organ toxicity, repeated exposure H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

COMPUTED DESCRIPTORS

Molecular Weight	99.994 g/mol
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	99.925249 g/mol
Monoisotopic Mass	99.925249 g/mol
Topological Polar Surface Area	51.2 Å²
Heavy Atom Count	4
Formal Charge	0
Complexity	61.8
Isotope Atom Count	0
Defined Atom Stereocenter Count	0
Undefined Atom Stereocenter Count	0
Defined Bond Stereocenter Count	0
Undefined Bond Stereocenter Count	0
Covalently-Bonded Unit Count	1
Compound Is Canonicalized	Yes

PRODUCT INTRODUCTION

description

Chromium trioxide, anhydrous appears as a dark purplish red solid. Under prolonged exposure to fire or heat the containers may explode. Highly toxic. A confirmed human carcinogen.