Ammonium heptamolybdate tetrahydrate
| IUPAC name
| Other names
| (NH4)6Mo7O24 (anhydrous)|
|Molar mass|| 1163.9 g/mol (anhydrous)|
1235.86 g/mol (tetrahydrate)
|Melting point|| tetrahydrate|
90 ˚C (194 ˚F; 363 K)
190 °C (374 ˚F; 463 K) (decomposition)
43 g/100 ml
|Vapor pressure||~0 mmHg|
|Safety data sheet||Sigma-Aldrich (tetrahydrate)|
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 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.
Ammonium heptamolybdate decomposes when heated.
Ammonium heptamolybdate is a white solid, soluble in water.
Can be purchased from chemical suppliers, or online from eBay.
- Phosphate detection
- Make colorful solutions
- Make potassium heptamolybdate
Ammonium heptamolybdate is irritant to touch and harmful if ingested.
Ammonium heptamolybdate is best kept in closed plastic bottles, away from acidic vapors.
Heating will cause it do decompose to MoO3.