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Chrome alum by li miss





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Chrome alum by
Article Posted: 03/02/2011
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Chrome alum


 
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Production and properties
Chrome alum
Chromium alum is produced from chromate salts or from ferrochromium alloys. Concentrated aqueous solutions of potassium dichromate can be reduced, usually with sulfur dioxide but also with alcohols or formaldehyde, in the presence of sulfuric acid at temperatures <40 C. Alternatively and less commonly, ferrochromium alloys can be dissolved in sulfuric acid and, after precipitation of the ferrous sulfate, the chrome alum crystallizes upon addition of potassium sulfate. Chromium alum crystallizes in regular octahedra with flattened corners and is very soluble in water. The solution reddens litmus and is an astringent. Aqueous solutions are dark violet and turns green when it is heated above 50C. In addition to the dodecahydrate, the hexahydrate KCr(SO4)26H2O, dihydrate KCr(SO4)22H2O, and the monohydrate KCr(SO4)2H2O are known.
Uses
Chromium alum is used in the tanning of leather as chromium(III) stabilizes the leather by cross linking the collagen fibers within the leather. However, this application is obsolete because the simpler chromium(III) sulfate is preferred.
References
^ a b c Holleman, Arnold F.; Wiberg, Egon; Wiberg, Nils; (1985). "Chromium" (in German). Lehrbuch der Anorganischen Chemie (91100 ed.). Walter de Gruyter. pp. 10821095. ISBN 3110075113. 
^ a b Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger, "Chromium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.
^ Brown, E. M.; Dudley, R.L.; Elsetinow A. R. (1997). "A Conformational Study of Collagen as Affected by Tanning Procedures". Journal of the American Leather Chemists Association 92: 225233. 
External links
Chrome Alum: Mineral Data
Categories: Sulfate minerals

Potassium compounds

Chromium compounds

Coordination compoundsChrome alumChrome alumChrome alumChrome alum

I am an expert from China Bags Wholesale, usually analyzes all kind of industries situation, such as seamless aluminum tubing , aluminum irrigation pipe.

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