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Ammonium chromate

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Ammonium chromate
Names
Other names Ammonium chromate(IV)
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.217 Edit this at Wikidata
EC Number
  • 232-138-4
PubChem CID
UNII
UN number 3085,3077
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Cr.2H3N.4O/h;2*1H3;;;;/q;;;;;2*-1/p+2Key: MFFLHUNPSHBKRG-UHFFFAOYSA-P
SMILES
  • ..(=O)(=O)
Properties
Chemical formula (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
Solubility in water 24.8 g/100ml (0 °C)
37.36 g/100ml (25 °C)
45.3 g/100ml (40 °C)
70.06 g/100ml (75 °C)
Thermochemistry
Std molar
entropy (S298) 		657 J/K·mol
Std enthalpy of
formation (ΔfH298) 		-1163 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Toxic
GHS labelling:
Pictograms GHS03: OxidizingGHS05: CorrosiveGHS08: Health hazardGHS09: Environmental hazard
Signal word Danger
Hazard statements H272, H314, H317, H334, H350, H400
Precautionary statements P201, P220, P261, P273, P280, P305+P351+P338
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

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 is 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.

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. "Ammonium chromate".
  3. ^ Sigma-Aldrich Co., Ammonium chromate. Retrieved on 28-04-2014.
  4. Information preview for Ammonium chromate, GIDEON
Ammonium salts
Inorganic salts
monatomic anions
oxyanions
other anions
Organic salts
Chromates and dichromates
Chromates
Chlorochromates
Chromate esters
Dichromates
Related
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