Trichromates, listing ammonium trichromate

List of Trichromates Ammonium Trichromate, (NH4)2Cr3010, mw 352.11 dk garnet-red, rhmb bipyramids mp-darkens at 110-20° decomp at 150-60°... 

List of Tetrachromates Ammonium Tetrachromate, (NH4)2Cr40)3, mw 452.12 brn-red hygroscopic crysts, less stable than Amm trichromate mp - blackens at 160°, melts at 170° and decomp spontaneously giving off nitrous fumes. Can be prepd by evapg, in cold over coned sulfuric acid, a soln of Amm trichromate in nitric acid, d 1.39(Refs 1 2). 

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See also in sourсe #XX -- [ , ]

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