Ammonium chromate

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Ammonium chromate
Chroman amonný.JPG
Names
Other names
Ammonium chromate(IV)
Identifiers
7788-98-9
ChemSpider 22997
ECHA InfoCard 100.029.217
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
-1163 kJ/mol
Hazards
Main hazards Toxic
GHS pictograms GHS-pictogram-rondflam.svgGHS-pictogram-acid.svgGHS-pictogram-silhouette.svgGHS-pictogram-pollu.svg[3]
GHS signal word Danger
H272, H314, H334, H350, H400[3]
P201, P220, P261, P273, P280, P305+351+338[3]
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
Except where otherwise noted, 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]

See also[edit]

References[edit]

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