Chromium(III) sulfate

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Chromium(III) sulfate
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Names
IUPAC name
Chromium(III) sulfate
Other names
Basic chromium sulfate, chromic sulfate
Identifiers
10101-53-8 YesY
13520-66-6 (dodecahydrate) N
ChemSpider 21241287 N
Jmol 3D model Interactive image
PubChem 24930
UNII Y0C99N5TMZ YesY
  • InChI=1S/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6 N
    Key: ANNXSSGQVXBUEI-UHFFFAOYSA-H N
  • InChI=1/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6
    Key: ANNXSSGQVXBUEI-CYFPFDDLAL
  • [Cr+3].[Cr+3].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.O.O.O.O.O.O.O.O.O.O.O.O
Properties
Cr2(SO4)3 • 12H2O
Molar mass 392.16 g/mol
608.363 g/mol (dodecahydrate)

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 to chromic acid
insoluble (anhydrous)
soluble (hydrated)
Solubility soluble in alcohol
practically insoluble in acid
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
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.[1]

Properties

Heating chromium(III) sulfate leads to partial dehydration to give a hydrated green salt (CAS#15244-38-9) 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.[2] 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. http://youtu. be /a0UCeTjhSJI
  2. Lua error in package.lua at line 80: module 'strict' not found.


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