Chromium(III) sulfate
IUPAC name	Chromium(III) sulfate
Other names	Basic chromium sulfate, chromic sulfate
Identifiers
CAS number	10101-53-8 Y, 13520-66-6 (dodecahydrate)
SMILES	[Cr+2].[Cr+2].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O
InChI	1/2Cr.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+2;;;/p-6
InChI key	LPRGTYRWAKBNSY-CYFPFDDLAG
ChemSpider ID	19951509
Properties
Molecular formula	H24Cr2S3O24
Molar mass	392.16 g/mol 716.45 g/mol (dodecahydrate)
Appearance	reddish-brown crystals
Density	3.10 g/cm3 (anhydrous) 1.86 g/cm3 (pentadecahydrate) 1.709 g/cm3 (octadecahydrate)
Solubility in water	insoluble (anhydrous) soluble (hydrates)
Hazards
EU Index	Not listed
Flash point	Non-flammable
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chromium(III) sulfate usually refers to the inorganic compound with the formula Cr₂(SO₄)₃ • 12(H₂O). This purple solid consists of the hydrated sulfate salt of [Cr(H₂O)₆]³⁺ ion. It is widely used in the tanning of leather.

[edit] Production and properties

Basic chromium sulfate is produced from chromate salts by reduction with sulfur dioxide, although other methods exist.^[1] Heating the violet solid leads to partial dehydration to give a hydrated green salt (CAS#10031-37-5) and eventually the anhydrous derivative (CAS#10101-53-8).

[edit] Hazards

It is a source of effluent pollution in the Ganges River in Kanpur, India.

[edit] References

1. ^ Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger, "Chromium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.

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