Chromium trioxide
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Chromium trioxide (also known as chromium(VI) oxide or chromic anhydride) is an inorganic compound with the formula CrO3. It is the acidic anhydride of chromic acid, and is sometimes marketed under the same name.[6] This compound is a dark-purple solid under anhydrous conditions and bright orange when wet. The substance dissolves in water accompanied by hydrolysis.[clarification needed] Millions of kilograms are produced annually, mainly for electroplating.[7] Chromium trioxide is a powerful oxidiser, a mutagen, and a carcinogen.[8]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Chromium trioxide | |
Other names
Chromic anhydride, Chromium(VI) oxide, Chromic acid (misnomer) | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.014.189 |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 1463 |
CompTox Dashboard (EPA) |
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Properties | |
CrO3 | |
Molar mass | 99.993 g·mol−1 |
Appearance | Dark red granular solid, deliquescent |
Odor | Odorless |
Density | 2.7 g/cm3 (20 °C)[1] |
Melting point | 197 °C (387 °F; 470 K)[1] |
Boiling point | 250 °C (482 °F; 523 K) decomposes[1] |
Solubility | Soluble in H2SO4, HNO3, (CH3CH2)2O, CH3COOH, (CH3)2CO |
+40·10−6 cm3/mol[1] | |
Thermochemistry | |
Std molar entropy (S⦵298) |
73.2 J/(mol·K)[3] |
Std enthalpy of formation (ΔfH⦵298) |
−589.3 kJ/mol[4] |
Hazards | |
GHS labelling: | |
[5] | |
Danger | |
H271, H301+H311, H314, H317, H330, H334, H335, H340, H350, H361f, H372, H410[5] | |
P210, P260, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338[5] | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
80 mg/kg (rats, oral)[6] |
Safety data sheet (SDS) | ICSC 1194 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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