Ammonium chromate

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]

Ammonium chromate
Names
Other names
Ammonium chromate(IV)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.217
EC Number
  • 232-138-4
UNII
UN number 3085,3077
Properties
(NH4)2CrO4
Molar mass 152.07 g/mol
Appearance yellow crystals
Density 1.90 g/ml
Melting point 185 °C (365 °F; 458 K) decomposes[1]
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]
Thermochemistry
657 J/K·mol
Std enthalpy of
formation (ΔfH⦵298)
 -1163 kJ/mol
Hazards
Main hazards Toxic
GHS pictograms [3]
GHS Signal word Danger
GHS hazard statements
 H272, H314, H317, H334, H350, H400[3]
P201, P220, P261, P273, P280, P305+351+338[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

See also

References
  1. 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. http://chemister.ru/Database/properties-en.php?dbid=1&id=6481
  3. Sigma-Aldrich Co., Ammonium chromate. Retrieved on 28-04-2014.
  4. Information preview for Ammonium chromate, GIDEON
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