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Merck
CN

243361

Chromium(III) potassium sulfate dodecahydrate

ACS reagent, ≥98%

Synonym(s):

Chrome alum, Potassium chromium(III) sulfate dodecahydrate

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About This Item

Linear Formula:
CrK(SO4)2 · 12H2O
CAS Number:
7788-99-0
Molecular Weight:
499.40
NACRES:
NB.24
PubChem Substance ID:
329752454
UNSPSC Code:
12352302
EC Number:
233-401-6
MDL number:
MFCD00149917
Assay:
≥98%, 98.0-102.0% (ACS specification)
Grade:
ACS reagent
Form:
crystals

Key Documents

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InChI key

ZFVHBEKVAITXHW-UHFFFAOYSA-J

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

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

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%

Quality Level

200

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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.

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.

pictograms

Exclamation mark
GHS07

signalword

Warning

hcodes

H315,H319

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2

Storage Class

11 - Combustible Solids

wgk

WGK 3

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Certificates of Analysis (COA)

Lot/Batch Number
MKCZ4204
MKCV8744
MKCR9475
MKCP7520
MKCM2995

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