Ammonium molybdate

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Template:Chembox E numberTemplate:Chembox SolubilityInWater
Ammonium molybdate
IUPAC name Ammonium molybdate
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Molar mass 196.02g mol-1
Appearance white crystalline solid
Density 2.498 g cm-3
Melting point
Main hazards Irritant
R-phrases R36/37/38
S-phrases S26
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Ammonium Molybdate is an odourless crystalline compound ranging in colour from white to yellow-green. Its chemical formula is as follows; (NH4)6Mo7O24.4H2O.

It is also called molybdic acid hexammonium salt tetrahydrate, ammonium molybdate tetrahydrate, and ammonium heptamolybdate tetrahydrate.


  • as an analytical reagent to find the presence of phosphates, silicates, arsenates and lead in pigments
  • in the production of molybdenum metal and ceramics
  • in the preparation of dehydrogenation and desulphurisation catalysts
  • in the fixing of metals
  • in electroplating
  • in fertilizers for crops.
  • as a negative stain in biological electron microscopy, typically in the 3-5% (vol/vol) concentration range and in the presence of trehalose [1]; or at saturated concentration to perform cryo-negative staining [2,3].



  1. Harris, J.R. and Horne, R.W. 1991. Negative staining, in Harris J. R. (Ed.), Electron Microscopy in Biology, Oxford University Press, Oxford.
  2. Adrian, M., Dubochet, J., Fuller, S.D. and Harris, J.R. 1998. Cryo-negative Staining. Micron 29, 145-160.
  3. De Carlo, S., El-Bez, C., Alvarez-Rúa, C., Borge, J. and Dubochet, J. 2002. Cryo-negative staining reduces electron-beam sensitivity of vitrified biological particles. J. Struct. Biol. 138, 216-226.

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