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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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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.

pictograms

Exclamation mark
GHS07

signalword

Warning

hcodes

H315,H319

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2

Storage Class

11 - Combustible Solids

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Certificates of Analysis (COA)

Lot/Batch Number
MKCZ4204
MKCV8744
MKCR9475
MKCP7520
MKCM2995

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M Van Der Hofstadt et al.
Ultramicroscopy, 154, 29-36 (2015-03-21)
With the use of the atomic force microscope (AFM), the Nanomicrobiology field has advanced drastically. Due to the complexity of imaging living bacterial processes in their natural growing environments, improvements have come to a standstill. Here we show the in
Ulf Yrlid et al.
Journal of leukocyte biology, 105(1), 195-202 (2018-09-29)
Endothelial injury makes the vessel wall vulnerable to cardiovascular diseases. Injured endothelium regenerates by collective sheet migration, that is, the endothelial cells coordinate their motion and regrow as a sheet of cells with retained cell-cell contacts into the wounded area.
Black Cr/α-Cr2O3 nanoparticles based solar absorbers.
Khamlich S, et al.
Physica B: Condensed Matter, 407(10), 1509-1512 (2012)
Mark W Moyle et al.
The Journal of cell biology, 204(5), 647-657 (2014-02-26)
Recruitment of Mad1-Mad2 complexes to unattached kinetochores is a central event in spindle checkpoint signaling. Despite its importance, the mechanism that recruits Mad1-Mad2 to kinetochores is unclear. In this paper, we show that MAD-1 interacts with BUB-1 in Caenorhabditis elegans.
R S Liem et al.
Acta morphologica Neerlando-Scandinavica, 22(3), 233-243 (1984-10-01)
The ultrastructure of endochondral bone was studied using an aqueous solution of chromic potassium sulphate as the decalcifying agent. 0.5 mm thick sections of rat tibiae were fixed in buffered glutaraldehyde, immersed in an aqueous solution of 1% chromic potassium
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