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Mercuric Dichromate, HgCr2O7

Mercuric Dichromate, HgCr2O7, is obtained as a light orange powder from a solution of the chromate in chromic acid, the concentration of the solution at 25° C. being greater than 10.46 gram-molecules of chromic acid per litre. It forms deep carmine-red crystals.

The compounds, Hg(NH3)2CrO4.H2O and (OHg2NH2)Cr2O7.3(NH4)2Cr2O7.2H2O, have been described, as also have compounds with pyridine and the double salt, 2NH2HgCl.HgCrO4.

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