Phosphomolybdic acid

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Phosphomolybdic acid
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Names
Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid
Identifiers
12026-57-2 YesY
51429-74-4 (hydrate) N
EC Number 234-713-5
MeSH Phosphomolybdic+acid
PubChem 53384541
Properties
H3PMo12O40
Molar mass 1825.25 g/mol
Density 1.62 g/ml[1] (hydrate)
Melting point 79-90 °C[1]
soluble
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
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 color intensifies with increasing number of double bonds in the molecule being stained.[2]

See also

References

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


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