Ammonium molybdate

Ammonium molybdate

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IUPACName = Ammonium molybdate
OtherNames =
Section1 = Chembox Identifiers
CASNo = 13106-76-8 (12054-85-2 for tetrahydrate)
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = (NH4)6Mo7O24·4H2O
MolarMass = 1235.86 g mol-1 (tetrahydrate)
Appearance = white crystalline solid
Density = 2.498 g cm-3
MeltingPt = ~90 ˚C
BoilingPt =
Solubility = soluble in water
Section3 = Chembox Hazards
MainHazards = Irritant
RPhrases = R36/37/38
SPhrases = S26
FlashPt =
Autoignition =

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.

Uses

*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] .

References

#Harris, J.R. and Horne, R.W. 1991. Negative staining, in Harris J. R. (Ed.), Electron Microscopy in Biology, Oxford University Press, Oxford.
#Adrian, M., Dubochet, J., Fuller, S.D. and Harris, J.R. 1998. Cryo-negative Staining. Micron 29, 145-160.
#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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