Ammonium chromate
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Other names Ammonium chromate(IV) | |
Identifiers | |
CAS Number |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.029.217 |
EC Number |
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PubChem CID |
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UNII |
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UN number | 3085,3077 |
CompTox Dashboard (EPA) |
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InChI
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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[1] |
Solubility in water | 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 | |
Std molar entropy (S⦵298) | 657 J/K·mol |
Std enthalpy of formation (ΔfH⦵298) | -1163 kJ/mol |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards | Toxic |
GHS labelling: | |
Pictograms | [3] |
Danger | |
Hazard statements | H272, H314, H317, H334, H350, H400[3] |
Precautionary statements | P201, P220, P261, P273, P280, P305+P351+P338[3] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 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.[4]
See also
References
- ^ 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.
- ^ "Ammonium chromate".
- ^ a b c Sigma-Aldrich Co., Ammonium chromate. Retrieved on 28-04-2014.
- ^ Information preview for Ammonium chromate, GIDEON
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Ammonium salts
monatomic anions |
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oxyanions |
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other anions |
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- Aluminon
- Ammonium acetate
- Ammonium adipate
- Ammonium benzoate
- Ammonium bituminosulfonate
- Ammonium carbamate
- Ammonium citrate
- Ammonium diethyl dithiophosphate
- Ammonium ferric citrate
- Ammonium formate
- Ammonium fumarate
- Ammonium glutamate
- Ammonium lactate
- Ammonium lauryl sulfate
- Ammonium malate
- Ammonium nonanoate
- Ammonium oxalate
- Ammonium picrate
- Ammonium perfluorononanoate
- Ammonium propionate
- Ammonium thioglycolate
- Cupferron
- Ferric ammonium oxalate
- Murexide