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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

grade

ACS reagent
puriss. p.a.

Quality Level

Agency

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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This Item
A6435A72101.01047
assay

≥99.5%

assay

≥98%

assay

≥98.0%

assay

99.0-100.5% (complexometric)

form

powder or crystals

form

powder

form

powder

form

solid

impurities

≤0.005% ammonium (NH4)

impurities

-

impurities

≤0.0005% Phosphorus (P), ≤0.005% Insoluble matter

impurities

≤0.005% Insoluble matter

pH

3.0-3.5 (20 °C, 10%)

pH

-

pH

-

pH

3.0-3.5 (20 °C, 100 g/L in H2O)

mp

92 °C (lit.)

mp

92 °C (lit.)

mp

92 °C (lit.)

mp

92.5 °C

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

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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