Ammonium chromate

Ammonium chromate
Names
Other names
Ammonium chromate(IV)
Identifiers
7788-98-9
ChemSpider 22997
Properties
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]
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 (ΔfHo298)
 -1163 kJ/mol
Hazards
Main hazards Toxic
GHS pictograms [3]
GHS signal word Danger
H272, H314, H334, H350, H400[3]
P201, P220, P261, P273, P280, P305+351+338[3]
EU classification O T N
R-phrases R8, R34, R43, R49, R50/53
S-phrases S17, S26, S36/37/39, S45, S53, S60, S61
Except where noted otherwise, data is 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]

References

  1. ↑ 1.0 1.1 1.2 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. ↑ 3.0 3.1 3.2 Sigma-Aldrich Co., Ammonium chromate. Retrieved on 28-04-2014.
  4. ↑ Information preview for Ammonium chromate, GIDEON