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227617

Sigma-Aldrich

Aluminum sulfate octadecahydrate

≥97%

Synonym(s):

Aluminum sulfate hydrate

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About This Item

Linear Formula:
Al2(SO4)3 · 18H2O
CAS Number:
7784-31-8
Molecular Weight:
666.43
EC Number:
233-135-0
UNSPSC Code:
12352302
PubChem Substance ID:
24853643
NACRES:
NB.24

Quality Level

200

assay

≥97%
98.0-102.0% (ACS specification)

form

chunks or granules
crystalline powder
powder or crystals

reaction suitability

reagent type: catalyst
core: aluminum

impurities

≤0.01% insolubles

anion traces

chloride (Cl-): ≤0.005%

cation traces

Ca: 0.01%
Fe: ≤0.002%
K: 0.005%
Mg: 0.002%
Na: 0.02%
heavy metals (as Pb): ≤0.001%

SMILES string

O=S(O)(O)=O.[AlH2][AlH2].O

InChI

1S/2Al.3H2O4S.9H2O/c;;3*1-5(2,3)4;;;;;;;;;/h;;3*(H2,1,2,3,4);9*1H2/q2*+3;;;;;;;;;;;;/p-6

InChI key

KFCWRPFNNIEZRY-UHFFFAOYSA-H

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General description

Aluminum sulfate is widely used as a coagulant in water treatment.

Application

Aluminum sulfate octadecahydrate has been used in the preparation of Gill′s no. 2 hematoxylin stain.

pictograms

Corrosion
GHS05

signalword

Danger

hcodes

H290,H314

Hazard Classifications

Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Journal of the American Ceramic Society. American Ceramic Society, 83(6), 1341-1345 (2000)
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Biogenic selenium, Se(0), has colloidal properties and thus poses solid-liquid separation problems, such as poor settling and membrane fouling. The separation of Se(0) from the bulk liquid was assessed by centrifugation, filtration, and coagulation-flocculation. Se(0) particles produced by an anaerobic
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Thermal decomposition kinetics of aluminum sulfate hydrate.
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