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Ammonium phosphomolybdate

Chemical compound From Wikipedia, the free encyclopedia

Ammonium phosphomolybdate
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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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The phosphomolybdate ion, [PMo12O40]3−.
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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 + 91 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.

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References

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