Ammonium chromate

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Ammonium chromate
Chroman amonný.JPG
CAS number 7788-98-9
ChemSpider 22997
Molecular formula H8CrN2O4
Molar mass 152.07 g mol−1
Appearance yellow crystals
Density 1.90 g/ml
Melting point 185 °C (365 °F; 458 K) decomposes[1]
Solubility in water 24.8 g/100ml (0 °C)
37.36 g/100ml (25 °C)[1]
45.3 g/100ml (40 °C)
70.06 g/100ml (75 °C)[1][2]
657 J/K·mol
-1163 kJ/mol
GHS pictograms GHS-pictogram-rondflam.svgGHS-pictogram-acid.svgGHS-pictogram-silhouete.svgGHS-pictogram-pollu.svg[3]
GHS signal word Danger
H272, H314, H334, H350, H400[3]
P201, P220, P261, P273, P280, P305+351+338[3]
EU classification Oxidizing Agent O Toxic T Dangerous for the Environment (Nature) N
R-phrases R8, R34, R43, R49, R50/53
S-phrases S17, S26, S36/37/39, S45, S53, S60, S61
Main hazards Toxic
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Ammonium chromate is a salt with the formula (NH4)2CrO4. It forms yellow, monoclinic crystals; made from ammonium hydroxide and ammonium dichromate; used in photography as a sensitizer for gelatin coatings. It's often used in photography, textile printing, and fixing chromate dyes on wool. It is also used as an analytical reagent, catalyst, and corrosion inhibitor. It is soluble in water, and, when applied, can cause irritation in the mucous membrane, eyes, respiratory tract, skin, etc. It may cause skin sensitization after prolonged contact. It is also known to be carcinogenic (cancer-causing), and it can cause tissue ulceration and injury to the liver and kidneys.[4]


  1. ^ a b c Perry, Dale L. (2011). Handbook of Inorganic Compounds, Second Edition. Boca Raton, Florida: CRC Press. ISBN 978-1-43981462-8. Retrieved 2014-04-28. 
  2. ^
  3. ^ a b c Sigma-Aldrich Co., Ammonium chromate. Retrieved on 28-04-2014.
  4. ^ Information preview for Ammonium chromate, GIDEON