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Encyclopedia
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Alum: Encyclopedia - Alum
Alum, in chemistry, is a term given to the crystallized double sulfates of the typical formula M+2SO4·M3+2(SO4)3·24H2O, where M+ is the...
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Alum: Encyclopedia Ii - Alum - Pliny's Writings
The word "alumen," which we translate "alum," occurs in Pliny's Natural History. In the 15th chapter of his 35th book he gives a detailed...
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Encyclopedia
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Alum: Encyclopedia Ii - Alum - Uses
Shaving alum is a powdered form of alum used as an astringent to prevent bleeding from small shaving cuts. The styptic pencils sold for t...
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Encyclopedia
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Alum: Encyclopedia Ii - Alum - Types Of Alum
Alum - Potash alum.
Potash alum, K2SO4·Al2(SO4)3·24H2O, crystallizes in regular octahedra and is very soluble in water. The solution ...
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Encyclopedia
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Alum: Encyclopedia Ii - Alum - Alchemical And Later Discoveries And Uses
The presence of sulfuric acid in potash alum was known to the alchemists. J. H. Pott and A. S. Marggraf demonstrated that alumina was ano...
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