Chromium(III) sulfate

Chromium(III) sulfate
Chromium(III) sulfate
Identifiers
CAS number 10101-53-8 YesY
13520-66-6 (dodecahydrate)
ChemSpider 19951509 YesY
UNII Y0C99N5TMZ YesY
Jmol-3D images Image 1
Properties
Molecular formula H24Cr2S3O24
Molar mass 392.16 g/mol
716.45 g/mol (octadecahydrate)
Appearance reddish-brown crystals (anhydrous), purple crystals (hydrated)
Density 3.10 g/cm3 (anhydrous)
1.86 g/cm3 (pentadecahydrate)
1.709 g/cm3 (octadecahydrate)
Melting point

90°C

Boiling point

decomposes at red heat

Solubility in water insoluble (anhydrous)
soluble (hydrates)
Hazards
MSDS MSDS
EU Index Not listed
NFPA 704
NFPA 704.svg
0
1
0
Flash point Non-flammable
 YesY (verify) (what is: YesY/N?)
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 consists of the hydrated sulfate salt of the metal aquo complex with the formula [Cr(H2O)6]3+, which is responsible for the purple color of this salt. It is widely used in the tanning of leather, with associated environmental damage.[citation needed]

Properties

Heating chromium(III) sulfate leads to partial dehydration to give a hydrated green salt (CAS#10031-37-5) and eventually the anhydrous derivative (CAS#10101-53-8).

Production

Basic chromium sulfate is produced from chromate salts by reduction with sulfur dioxide, although other methods exist.[1] The hydrous form may be formed by the reaction of chromium(III) oxide and sulfuric acid.

Cr2O3 + 3 H2SO4 → Cr2(SO4)3 + 3 H2O

References

  1. ^ Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger (2005), "Chromium Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a07_067 

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