Chromium (VI) oxide dichloride

Structural formula
General
Surname	Chromium (VI) oxide dichloride
other names	Chromyl dichloride; Chromic acid dichloride; Chromium oxychloride; Chromyl chloride; Chromium oxychloride; Etard's reagent;
Molecular formula	CrO 2 Cl 2
Brief description	volatile, blood-red liquid
External identifiers / databases
EC number	239-056-8
ECHA InfoCard	100.035.491
PubChem	22150757
ChemSpider	21106426
Wikidata	Q417044
properties
Molar mass	154.90 g mol −1
Physical state	liquid
density	1.91 g cm −3
Melting point	−96.5 ° C
boiling point	117 ° C
Vapor pressure	26.6 h Pa (20 ° C)
solubility	violent decomposition in water
safety instructions
H and P phrases	H: 271-314-317-340-350i-410
	P: 201-210-273-280-303 + 361 + 353-305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromium (VI) oxide dichloride is a chemical compound from the group of metal oxides or chlorine compounds . It is in the form of a volatile, blood-red liquid that smokes in moist air.

Extraction and presentation

Chromium (VI) oxide dichloride can be produced by reacting hydrogen chloride with chromic acid or chromium trioxide .

{\ displaystyle {\ ce {CrO3 + 2HCl -> CrO2Cl2 + H2O}}}

It can also be produced by reacting potassium chromate with sodium chloride and sulfuric acid.

{\ displaystyle {\ ce {K2CrO4 + 2NaCl + 2H2SO4 ->}}}

{\ displaystyle {\ ce {CrO2Cl2 + Na2SO4 + K2SO4 + 2H2O}}}

properties

Chromium (VI) oxide dichloride is highly electrophilic and has an oxidizing effect. It decomposes violently in water, producing hydrochloric acid or chlorine vapors as well as chromic acid . The compound's vapors are five times as heavy as air.

use

Chromium (VI) oxide dichloride is used as an oxidizing agent (e.g. in the conversion of alkenes to aldehydes ), in the tannery as a pickling agent and as a detection agent for chlorine.

safety instructions

Chromium (VI) oxide dichloride is classified as carcinogenic and mutagenic category 2. It is not flammable, but strongly oxidizing.

Web links

Commons : Chromium (VI) Oxide Dichloride - Collection of Pictures, Videos and Audio Files

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on chromium (VI) oxide dichloride in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .
↑ Entry on Chromyl dichloride in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 .

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Entry on chromium (VI) oxide dichloride in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .

[CLP_100.035.491-2] Entry on Chromyl dichloride in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[3] Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 .