31242

Sigma-Aldrich

Aluminum potassium sulfate dodecahydrate

puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5%

Synonym(s):
Alum, Potassium alum, Potassium aluminum sulfate dodecahydrate
Linear Formula:
AlK(SO4)2 · 12H2O
CAS Number:
Molecular Weight:
474.39
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NB.24

Quality Level

grade

ACS reagent
puriss. p.a.

Agency/Method

reag. Ph. Eur.

assay

≥99.5%

form

powder or crystals

impurities

≤0.005% ammonium (NH4)

pH

3.0-3.5 (20 °C, 10%)

mp

92 °C (lit.)

density

1.757 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤5 mg/kg

cation traces

As: ≤2 mg/kg
Cd: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
Na: ≤100 mg/kg
Pb: ≤10 mg/kg

SMILES string

O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O

InChI

1S/Al.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

GNHOJBNSNUXZQA-UHFFFAOYSA-J

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General description

Aluminum potassium sulfate dodecahydrate is an inorganic sulfate salt of aluminum and potassium. Linear growth rates of (100), (111) and (110) faces of its crystals have been investigated.

storage_class_code

13 - Non Combustible Solids

WGK Germany

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Michael S Sinyakov et al.
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Growth rates of aluminum potassium sulfate crystals in aqueous solutions.
Botsaris GD and Denk Jr EG.
Industrial & Engineering Chemistry Fundamentals, 9(2), 276-283 (1970)
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