Ammonium phosphomolybdate

Ammonium phosphomolybdate[1]
Names
	Other names Ammonium molybdophosphate; Triammonium 12-molybdophosphate
Identifiers
CAS Number	12026-66-3 ; 54723-94-3 (hydrate);
3D model (JSmol)	Interactive image;
ChemSpider	21241450 ;
ECHA InfoCard	100.031.545
EC Number	234-714-0;
PubChem CID	90479084;
UNII	F7YCY6MSAO;
	InChI InChI=1S/12Mo.3H3N.H3O4P.36O/c;;;;;;;;;;;;;;;1-5(2,3)4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/h;;;;;;;;;;;;3*1H3;(H3,1,2,3,4);;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Key: RIAJLMJRHLGNMZ-UHFFFAOYSA-N ;
	SMILES [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
Chemical formula	(NH4)3PMo12O40
Molar mass	1876.35 g/mol
Appearance	Yellow crystals
Melting point	Decomposes
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H315, H319, H335[2]
GHS precautionary statements	P261, P305+351+338[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

Ammonium phosphomolybdate is the inorganic salt of phosphomolybdic acid with the chemical formula (NH₄)₃PMo₁₂O₄₀. It contains the phosphomolybdate ion complex.

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.

12(NH₄)₂MoO₄ + H₃PO₄ + 21 HNO₃ → (NH₄)₃PMo₁₂O₄₀↓ + 21 NH₄NO₃ + 12 H₂O

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