Chromium trioxide

Chromium trioxide
	; Chromium, Cr Oxygen, O
Names
	IUPAC name Chromium trioxide
	Other names Chromic anhydride, Chromium(VI) oxide, Chromic acid (misnomer)
Identifiers
CAS Number	1333-82-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48240 ;
ChemSpider	14212 ;
ECHA InfoCard	100.014.189
PubChem CID	14915;
RTECS number	GB6650000;
UNII	8LV49809UC ;
UN number	1463
CompTox Dashboard (EPA)	DTXSID0040125 ;
	InChI InChI=1S/Cr.3O Key: WGLPBDUCMAPZCE-UHFFFAOYSA-N ; InChI=1/Cr.3O/rCrO3/c2-1(3)4 Key: WGLPBDUCMAPZCE-YFSAMUSXAF;
	SMILES O=[Cr](=O)=O;
Properties
Chemical formula	CrO3
Molar mass	99.993 g·mol−1
Appearance	Dark red granular solid, deliquescent
Odor	Odorless
Density	2.7 g/cm3 (20 °C)
Melting point	197 °C (387 °F; 470 K)
Boiling point	250 °C (482 °F; 523 K) ; decomposes
Solubility in water	164.8 g/(100 mL) (0 °C); 169 g/(100 mL) (25 °C); 172.6 g/(100 mL) (40 °C); 198.1 g/(100 mL) (100 °C);
Solubility	Soluble in H2SO4, HNO3, (CH3CH2)2O, CH3COOH, (CH3)2CO
Magnetic susceptibility (χ)	+40·10−6 cm3/mol
Thermochemistry
Std molar; entropy (S⦵298)	73.2 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−589.3 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H301+H311, H314, H317, H330, H334, H335, H340, H350, H361f, H372, H410
Precautionary statements	P210, P260, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338
NFPA 704 (fire diamond)	4 0 2 OX
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	80 mg/kg (rats, oral)
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). verify (what is ?) Infobox references

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]

^ ^a ^b ^c ^d ^e Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
^ Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). D. Van Nostrand Company. p. 250.
^ "chromium(VI) oxide". chemister.ru.
^ Pradyot, Patnaik (2003). Handbook of Inorganic Chemicals. The McGraw-Hill Companies, Inc. ISBN 0-07-049439-8.
^ ^a ^b ^c Sigma-Aldrich Co., Chromium(VI) oxide. Retrieved on 2021-11-22.
^ ^a ^b ^c "Chromium trioxide". chemicalland21.com. AroKor Holdings Inc. Retrieved 2014-06-15.
^ Anger, G.; Halstenberg, J.; Hochgeschwender, K.; Scherhag, C.; Korallus, U.; Knopf, H.; Schmidt, P.; Ohlinger, M. (2000). "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a07_067. ISBN 3527306730.
^ Mamyrbaev, Arstan Abdramanovich; Dzharkenov, Timur Agataevich; Imangazina, Zina Amangalievna; Satybaldieva, Umit Abulkhairovna (2015-04-16). "Mutagenic and carcinogenic actions of chromium and its compounds". Environmental Health and Preventive Medicine. 20 (3). Springer Science and Business Media LLC: 159–167. doi:10.1007/s12199-015-0458-2. ISSN 1342-078X. PMC 4434237. PMID 25877777.

[crc-1] Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.

[sioc-2] Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). D. Van Nostrand Company. p. 250.

[chemister-3] "chromium(VI) oxide". chemister.ru.

[pphoic-4] Pradyot, Patnaik (2003). Handbook of Inorganic Chemicals. The McGraw-Hill Companies, Inc. ISBN 0-07-049439-8.

[sigma-5] Sigma-Aldrich Co., Chromium(VI) oxide. Retrieved on 2021-11-22.

[chemicalland21-6] "Chromium trioxide". chemicalland21.com. AroKor Holdings Inc. Retrieved 2014-06-15.

[ullmanns-7] Anger, G.; Halstenberg, J.; Hochgeschwender, K.; Scherhag, C.; Korallus, U.; Knopf, H.; Schmidt, P.; Ohlinger, M. (2000). "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a07_067. ISBN 3527306730.

[8] Mamyrbaev, Arstan Abdramanovich; Dzharkenov, Timur Agataevich; Imangazina, Zina Amangalievna; Satybaldieva, Umit Abulkhairovna (2015-04-16). "Mutagenic and carcinogenic actions of chromium and its compounds". Environmental Health and Preventive Medicine. 20 (3). Springer Science and Business Media LLC: 159–167. doi:10.1007/s12199-015-0458-2. ISSN 1342-078X. PMC 4434237. PMID 25877777.

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Names
Chromium, Cr Oxygen, O

IUPAC name Chromium trioxide
Other names Chromic anhydride, Chromium(VI) oxide, Chromic acid (misnomer)
Identifiers
CAS Number	1333-82-0^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:48240^Y
ChemSpider	14212^Y
ECHA InfoCard	100.014.189
PubChem CID	14915
RTECS number	GB6650000
UNII	8LV49809UC^Y
UN number	1463
CompTox Dashboard (EPA)	DTXSID0040125
InChI InChI=1S/Cr.3O^Y Key: WGLPBDUCMAPZCE-UHFFFAOYSA-N^Y InChI=1/Cr.3O/rCrO3/c2-1(3)4 Key: WGLPBDUCMAPZCE-YFSAMUSXAF
SMILES O=[Cr](=O)=O
Properties
Chemical formula	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 in water	164.8 g/(100 mL) (0 °C) 169 g/(100 mL) (25 °C)^[1] 172.6 g/(100 mL) (40 °C) 198.1 g/(100 mL) (100 °C)^[2]
Solubility	Soluble in H₂SO₄, HNO₃, (CH₃CH₂)₂O, CH₃COOH, (CH₃)₂CO
Magnetic susceptibility (χ)	+40·10⁻⁶ cm³/mol^[1]
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	73.2 J/(mol·K)^[3]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	−589.3 kJ/mol^[4]
Hazards
GHS labelling:
Pictograms	^[5]
Signal word	Danger
Hazard statements	H271, H301+H311, H314, H317, H330, H334, H335, H340, H350, H361f, H372, H410^[5]
Precautionary statements	P210, P260, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338^[5]
NFPA 704 (fire diamond)	^[6] 4 0 2 OX
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). Y verify (what is ^YN ?) Infobox references