Ammonium phosphomolybdate

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.

Ammonium phosphomolybdate[1]
Names
Other names
Ammonium molybdophosphate
Triammonium 12-molybdophosphate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.545
EC Number
  • 234-714-0
UNII
  • InChI=1S/12Mo.3H3N.H3O4P.36O/c;;;;;;;;;;;;;;;1-5(2,3)4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/h;;;;;;;;;;;;3*1H3;(H3,1,2,3,4);;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; checkY
    Key: RIAJLMJRHLGNMZ-UHFFFAOYSA-N checkY
  • [NH4+].[NH4+].[NH4+].[O-]P(=O)([O-])[O-].O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O
Properties
(NH4)3PMo12O40
Molar mass 1876.35 g/mol
Appearance Yellow crystals
Melting point Decomposes
Hazards
GHS labelling:
GHS07: Exclamation mark
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).
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Infobox references
The phosphomolybdate ion, [PMo12O40]3−.

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 is as a hexahydrate, which is a dark yellow fine crystal, and poorly soluble in water.[3]

References
  1. ChemicalBook: http://www.chemicalbook.com/ChemicalProductProperty_EN_CB6162083.htm
  2. "Ammonium phosphomolybdate hydrate".
  3. Dias, José Alves; Dias, Sílvia Cláudia Loureiro; Caliman, Ednéia (2014). "Keggin Structure Polyoxometalates". Inorganic Syntheses: Volume 36. Inorganic Syntheses. Vol. 36. pp. 210–217. doi:10.1002/9781118744994.ch39. ISBN 9781118744994.
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