Phosphomolybdic acid

Phosphomolybdic acid
Phosphomolybdic acid
Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid
Identifiers
CAS number 12026-57-2 YesY, 
51429-74-4 (hydrate)
EC number 234-713-5
MeSH Phosphomolybdic+acid
Properties
Molecular formula H3PMo12O40
Molar mass 1825.25 g/mol
Hazards
EU Index Not listed
Flash point Non-flammable
 YesY acid (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Phosphomolybdic acid, also known as dodeca molybdophosphoric acid or PMA is a component of Masson's trichrome stain. It is a yellow-green compound, freely soluble in water and polar organic solvents such as ethanol. It is used as a reagent in thin layer chromatography for staining phenolics, hydrocarbon waxes, alkaloids and steroids.

Conjugated, unsaturated compounds reduce PMA to molybdenum blue. The colour intensifies with increasing number of double bonds in the molecule being stained.[1]

See also

References

  1. ^ Reduction of Phosphomolybdic Acid by Compounds Possessing Conjugated Double Bonds, S. Burstein, Anal. Chem., 1953, 25 (3), pp 422–424

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