243361

Chromium(III) potassium sulfate dodecahydrate

ACS reagent, ≥98%

• Synonym(s): Chrome alum, Potassium chromium(III) sulfate dodecahydrate
• Linear Formula: CrK(SO₄)₂ · 12H₂O
• CAS Number: 7788-99-0
• Molecular Weight: 499.40
• EC Number: 233-401-6
• MDL number: MFCD00149917
• UNSPSC Code: 12352302
• PubChem Substance ID: 329752454
• NACRES: NB.24

Properties

• grade: ACS reagent
• Assay: ≥98%; 98.0-102.0% (ACS specification)
• form: crystals
• reaction suitability: reagent type: catalyst; core: chromium
• 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%
• SMILES string: O.O.O.O.O.O.O.O.O.O.O.O.[K+].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O
• InChI: 1S/Cr.K.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4
• InChI key: ZFVHBEKVAITXHW-UHFFFAOYSA-J

Description

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.

Application

Chromium(III) potassium sulfate dodecahydrate [KCr(SO₄)₂.12H₂O] has been used for the dissolution of gelatin in various studies.
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.

Safety Information

• Pictograms: GHS07
• Signal Word: Warning
• Hazard Statements: H315,H319
• Precautionary Statements: P264 - P280 - P302 + P352 - P305 + P351 + P338 - P332 + P313 - P337 + P313
• Hazard Classifications: Eye Irrit. 2 - Skin Irrit. 2
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3