Ammonium phosphomolybdate
{{Chembox
| Verifiedfields = changed
| verifiedrevid = 402303672
| Name = Ammonium phosphomolybdateChemicalBook: http://www.chemicalbook.com/ChemicalProductProperty_EN_CB6162083.htm
| ImageFile = Ammonium 12-molybdophosphate.jpg
| ImageSize = 200px
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| OtherNames = Ammonium molybdophosphate
Triammonium 12-molybdophosphate
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|changed|??}}
| CASNo = 12026-66-3
| CASNoOther = 54723-94-3 (hydrate)
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 21241450
| PubChem = 90479084
| 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
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = InChI=1S/12Mo.3H3N.H3O4P.36O/c;;;;;;;;;;;;;;;1-5(2,3)4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/h;;;;;;;;;;;;3*1H3;(H3,1,2,3,4);;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = RIAJLMJRHLGNMZ-UHFFFAOYSA-N
| UNII = F7YCY6MSAO
| Abbreviations =
| EC_number = 234-714-0
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| UNNumber =
}}
|Section2={{Chembox Properties
| Formula = (NH4)3PMo12O40
| MolarMass = 1876.35 g/mol
| Appearance = Yellow crystals
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| MeltingPt = Decomposes
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|Section3={{Chembox Structure
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|Section4={{Chembox Thermochemistry}}
|Section5={{Chembox Pharmacology}}
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|Section7={{Chembox Hazards
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| GHSPictograms = {{GHS07}}
| GHSSignalWord= Warning
| HPhrases = {{H-phrases|315|319|335}}{{cite web|url=http://www.sigmaaldrich.com/catalog/product/aldrich/342165 |title=Ammonium phosphomolybdate hydrate }}
| PPhrases = {{P-phrases|261|305+351+338}}}}
|Section8={{Chembox Related
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File:Phosphotungstate-3D-polyhedra.png
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.
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.{{cite book |doi=10.1002/9781118744994.ch39|chapter=Keggin Structure Polyoxometalates |volume=36 |year=2014 |last1=Dias |first1=José Alves |last2=Dias |first2=Sílvia Cláudia Loureiro |last3=Caliman |first3=Ednéia |title=Inorganic Syntheses: Volume 36 | pages=210–217|isbn=9781118744994 }}
:{{chem2|12 (NH4)6Mo7O24(H2O)4 + 7 Na2HPO4(H2O) + 65 HNO3 →}} {{chem2|7 (NH4)3Mo12PO40 + 51 NH4NO3 + 14 NaNO3 + 91 H2O}}
Normally, it often exists as a hexahydrate, a dark yellow fine crystal which is poorly soluble in water.
It is also obtained as a test result for phosphate ions.