Nomenclature
CAS number: 10043-01-3
Sulfuric acid aluminum salt (3:2); aluminum(III) sulfate; Stingose (Pfizer).
Al
2O
12S
3; mol wt 342.15.
Al 15.77%, O 56.11%, S 28.11%.
Al
2(SO
4)
3.
Description and references
Occurs in nature as the mineral alunogenite. Prepn: Gmelins, Aluminum (8th ed.) 35B, pp 267-269 (1934). Soly in aqueous ethanol:
A. B. Gancy, C. A. Wamser, J. Chem. Eng.
Data 24, 192 (1979). Prepn and characterization
of hydrated forms: A. B. Gancy, Thermochim.
Acta 54, 105 (1982). Thermal decompn studies:
K.-S. Chou, C.-S. Soong, ibid. 78, 285, 305
(1984); Y. Pelovski et al., ibid. 205, 219, 283 (1992). Evaluation as a first-aid treatment for stings
and bites: D. Henderson, R. G. Easton, Med.
J. Aust. 2, 146 (1980).
Properties
White, lustrous crystals, pieces, granules, or
powder. d 1.61. Melts
when gradually heated. At 250° loses its water; decomposes at red
heat. Sol in 1 part water. Practically insol in alcohol. On long
boiling of the aq soln, insol basic salt ppts. The aq soln is acid.Derivative
Hydrate.
Nomenclature
CAS number: 7784-31-8 (octadecahydrate)
Al
2O
12S
3.18H
2O; mol wt 666.43.
Al 8.10%, O 72.02%, S 14.43%, H 5.44%.
Properties
The commercial product is also known as cake alum or patent alum. It is available in degrees of hydration ranging from
14 to 18 molecules of water. Miscible with water.Use
Tanning leather, sizing paper, mordant in dyeing;
purifying water; manuf lakes, aluminum resinate; fireproofing and
waterproofing cloth; clarifying oils and fats; treating sewage; waterproofing
concrete; deodorizing and decolorizing petroleum; antiperspirants;
agricultural pesticides; manuf aluminum salts; prepn of aluminum acetate
solns.
Therapeutic Category
Astringent; in treatment of insect and marine organism stings
and bites.
Keywords
Astringent