Ammonium phosphomolybdate is the inorganic salt of phosphomolybdic acid with the chemical formula (NH4)3PMo12O40. The salt contains the phosphomolybdate anion, a well known heteropolymetalate of the Keggin structural class.
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Names | |
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Other names Ammonium molybdophosphate Triammonium 12-molybdophosphate | |
Identifiers | |
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3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.031.545 |
EC Number |
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PubChem CID | |
UNII | |
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Properties | |
(NH4)3PMo12O40 | |
Molar mass | 1876.35 g/mol |
Appearance | Yellow crystals |
Melting point | Decomposes |
Hazards | |
GHS labelling: | |
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Warning | |
H315, H319, H335[2] | |
P261, P305+P351+P338[2] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Phosphotungstate-3D-polyhedra.png/150px-Phosphotungstate-3D-polyhedra.png)
Synthesis
Ammonium phosphomolybdate can be made by heating ammonium orthomolybdate combined with phosphoric acid and nitric acid, yielding ammonium nitrate, water, and a yellow precipitate of ammonium phosphomolybdate is obtained.[3]
- 12 (NH4)6Mo7O24(H2O)4 + 7 Na2HPO4(H2O) + 65 HNO3 → 7 (NH4)3Mo12PO40 + 51 NH4NO3 + 14 NaNO3 + 56 H2O
Normally, it often exists as a hexahydrate, a dark yellow fine crystal which is poorly soluble in water.[3]
It is also obtained as a test result for phosphate ions.
References
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