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Ammonium Chromate, (NH4)2CrO4

Ammonium Chromate, (NH4)2CrO4, is formed when a solution of chromic acid is neutralised by ammonia, and the mixture evaporated. It yields golden-yellow needles (monoclinic prisms):

a:b:c = 1.9603:1:1.2226; β = 115° 13',

of density 1.886, and soluble in water. On heating or on exposure to air they decompose, evolving ammonia, and form the dichromate:

2(NH4)2CrO4 = (NH4)2Cr2O7 + 2NH3 + H2O;

consequently the chromate cannot be dried at 100° C. without undergoing decomposition.

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