Chromium(III) potassium sulfate dodecahydrate

ACS reagent, ≥98%

Synonym: Chrome alum, Potassium chromium(III) sulfate dodecahydrate

• CAS Number 7788-99-0

• Linear Formula CrK(SO₄)₂ · 12H₂O

• Molecular Weight 499.40

•  EC Number 233-401-6

•  MDL number MFCD00149917

•  PubChem Substance ID 24854611

  Properties

  Related Categories	Catalysis and Inorganic Chemistry, Chemical Synthesis, Chromium, Chromium Salts, Essential Chemicals, Research Essentials, Salts
  grade	ACS reagent
  assay	≥98%
  	98.0-102.0% (ACS specification)
  impurities	≤0.01% insolubles
  mp	89 °C(lit.)
  anion traces	chloride (Cl-): ≤0.002%
  cation traces	Al: ≤0.02%
  	Fe: ≤0.01%
  	NH4+: ≤0.01%
  	heavy metals (as Pb): ≤0.01%

  Description

  Packaging

  5, 100, 500 g in poly bottle

  Application

  Chromium(III) potassium sulfate dodecahydrate [KCr(SO₄)₂.12H₂O] has been used for the dissolution of gelatin in various studies.^[1][2]
  It may be used as a starting material in the synthesis of quasi-monodisperse spherical core-shell particles of Cr/α-Cr₂O₃ to be used as solar absorbers.^[4]

  General description

  Chromium(III) potassium sulfate dodecahydrate (Potassium chromium(III) sulfate dodecahydrate, Chrome alum) is widely used chemical in dyeing and textile industry. It can be synthesized by reacting sulfur dioxide with potassium dichromate (dissolved in sulfuric acid) at -38°C.^[3]