Chemistry:Ammonium chromate

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Ammonium chromate
Chroman amonný.JPG
Names
Other names
Ammonium chromate(IV)
Identifiers
3D model (JSmol)
ChemSpider
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
-1163 kJ/mol
Hazards
Main hazards Toxic
GHS pictograms GHS03: OxidizingGHS05: CorrosiveGHS08: Health hazardGHS09: Environmental hazard[3]
GHS Signal word Danger
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

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.[4]

See also

References