Nomenclature
CAS number: 7788-98-9
Chromic acid (H
2CrO
4) ammonium salt (1:2); neutral ammonium chromate; diammonium chromate.
CrH
8N
2O
4; mol wt 152.07.
Cr 34.19%, H 5.30%, N 18.42%, O 42.08%.
(NH
4)
2CrO
4.
Description and 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.Use
Sensitizing gelatin in photography, in textile printing
pastes, in fixing chromate dyes on wool, and as a reagent in analytical
chemistry.