Ammonium Chromate(VI)

Title: Ammonium Chromate(VI)
CAS Registry Number: 7788-98-9
Additional Names: Neutral ammonium chromate
Molecular Formula: CrH8N2O4
Molecular Weight: 152.07
Percent Composition: Cr 34.19%, H 5.30%, N 18.42%, O 42.08%
Line Formula: (NH4)2CrO4
Literature References: Prepn: Gmelins, Chromium (8th ed.) 52, part B, pp 707-712 (1962).
Properties: Yellow acicular crystals; loses some NH3 in air; decomposes at 185°. d 1.8. Soly in water: 19.78% (0°); 41.20% (75°). Sparingly sol in liquid ammonia, acetone. Slightly sol in methanol. Practically insol in ethanol. The aq soln is alkaline. Keep well closed.
Density: d 1.8
Use: Sensitizing gelatin in photography, in textile printing pastes, in fixing chromate dyes on wool, and as a reagent in analytical chemistry.
Ammonium Chromic Sulfate Ammonium Citrate, Dibasic Ammonium Cobaltous Phosphate Ammonium Cobaltous Sulfate Ammonium Cupric Chloride