Ammonium heptamolybdate
 Ammonium heptamolybdate tetrahydrate
| |
| Names | |
|---|---|
| IUPAC name
Ammonium docosaoxoheptamolybdate(6–)
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| Other names
Ammonium paramolybdate
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| Properties | |
| (NH4)6Mo7O24 (anhydrous) (NH4)6Mo7O24·4H2O (tetrahydrate) | |
| Molar mass | 1163.9 g/mol (anhydrous) 1235.86 g/mol (tetrahydrate) |
| Appearance | White solid |
| Odor | Odorless |
| Density | 2.498 g/cm3 |
| Melting point | tetrahydrate 90 ˚C (194 ˚F; 363 K) anhydrous 190 °C (374 ˚F; 463 K) (decomposition) |
| Boiling point | Decomposes |
| tetrahydrate 43 g/100 ml | |
| Vapor pressure | ~0 mmHg |
| Hazards | |
| Safety data sheet | Sigma-Aldrich (tetrahydrate) |
| Flash point | Non-flammable |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
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Ammonium heptamolybdate is an inorganic compound with the chemical formula (NH4)6Mo7O24. It is commonly encountered as tetrahydrate (NH4)6Mo7O24·4H2O.
While it is also referred to as ammonium molybdate, the term is also used for ammonium orthomolybdate, (NH4)2MoO4.
Contents
Properties
Chemical
Ammonium heptamolybdate decomposes when heated.
Physical
Ammonium heptamolybdate is a white solid, soluble in water.
Availability
Can be purchased from chemical suppliers, or online from eBay.
Preparation
Ammonium heptamolybdate can be easily prepared by dissolving molybdenum trioxide in an excess of aqueous ammonia, followed by evaporating the solution at room temperature.
Projects
- Phosphate detection
- Make colorful solutions
- Make potassium heptamolybdate
Handling
Safety
Ammonium heptamolybdate is irritant to touch and harmful if ingested.
Storage
Ammonium heptamolybdate is best kept in closed plastic bottles, away from acidic vapors.
Disposal
Heating will cause it do decompose to MoO3.
