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.