1333-82-0
Product Name:
Chromium(VI) oxide
Formula:
CrO3
Synonyms:
Chromic anhydride;Chromic anhydride, Chromium trioxide;Chromium(VI) oxide
Inquiry
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 Ų |
| 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.