Chromosulfuric acid

Structural formula
	+ CrO 3
General
Surname	Chromosulfuric acid
Molecular formula	H 2 SO 4 + CrO 3
Brief description	dark red, odorless liquid
External identifiers / databases
EC number	613-764-0
ECHA InfoCard	100.108.243
Wikidata	Q905121
properties
Molar mass	198.07 g mol −1
Physical state	liquid
density	1.85 g cm −3 (20 ° C)
boiling point	340 ° C (decomposition)
solubility	miscible with water
safety instructions
H and P phrases	H: 271-290-301-312-330-314-317-334-335-340-350-361f-372-410
	P: 201-280-301 + 330 + 331 + 310-304 + 340 + 310-305 + 351 + 338-308 + 313
MAK	repealed as carcinogenic
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Chromosulfuric acid is a brownish, viscous liquid with the formula H ₂ SO ₄ / CrO ₃ , which mainly consists of concentrated sulfuric acid and about 5% chromium trioxide (chromium (VI) oxide) . The compound is classified as an oxidizing hazardous substance .

It is used for cleaning glassware because of its strong oxidizing effect. However, due to the content of extremely toxic and carcinogenic chromium (VI) oxide and the damage to the environment, its use should be avoided.

Alternative cleaning agents are mainly surfactants or mixtures of hydrogen peroxide and sulfuric acid (some of which contain Caro's acid ).

To dispose of chromosulfuric acid, it should first be carefully diluted with water (slowly stirred into water while cooling) and then a reducing agent , preferably ethanol , should be added. As a result, the hexavalent chromium is reduced to non- carcinogenic trivalent chromium with a green color .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Entry on chromosulfuric acid in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry Chromium (VI) compounds, with the exception of barium chromate and compounds that are listed separately in this appendix in Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on June 11, 2019. Manufacturers or distributors can expand the harmonized classification and labeling .
^ Römpp CD 2006, Georg Thieme Verlag 2006.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g Entry on chromosulfuric acid in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .

[CLP_100.240.768-2] Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry Chromium (VI) compounds, with the exception of barium chromate and compounds that are listed separately in this appendix in Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on June 11, 2019. Manufacturers or distributors can expand the harmonized classification and labeling .

[3] Römpp CD 2006, Georg Thieme Verlag 2006.