Ammonium dichromate
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Ammonium dichromate is an inorganic compound with the formula (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, chromium is in a +6 oxidation state, commonly known as hexavalent chromium. It is a salt consisting of ammonium ions and dichromate ions.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Ammonium dichromate | |
Other names
Ammonium bichromate Ammonium pyrochromate | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.029.221 |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 1439 |
CompTox Dashboard (EPA) |
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Properties | |
(NH4)2Cr2O7 | |
Molar mass | 252.07 g/mol |
Appearance | Orange-red crystals |
Odor | odorless |
Density | 2.115 g/cm3 |
Melting point | 180 °C (356 °F; 453 K) decomposes |
18.2 g/100 ml (0 °C) 35.6 g/100 ml (20 °C) 40 g/100 ml (25 °C) 156 g/100 ml (100 °C) | |
Solubility | insoluble in acetone soluble in ethanol |
Structure | |
monoclinic | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Very toxic, explosive, oxidizing, carcinogenic, mutagenic, dangerous for the environment |
GHS labelling: | |
[1] | |
H272, H301, H312, H314, H317, H330, H334, H340, H350, H360, H372, H410[1] | |
P201, P220, P260, P273, P280, P284[1] | |
NFPA 704 (fire diamond) | |
190 °C (374 °F; 463 K) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
20–250 mg/kg |
Safety data sheet (SDS) | ICSC 1368 |
Related compounds | |
Other cations |
Potassium dichromate Sodium dichromate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ammonium dichromate is sometimes known as Vesuvian Fire, because of its use in demonstrations of tabletop "volcanoes".[2] However, this demonstration has become unpopular in schools due to the compound's carcinogenic nature. It has also been used in pyrotechnics and in the early days of photography.