| Phosphomolybdic acid | |
|---|---|
|
Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid |
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| Identifiers | |
| CAS number | 12026-57-2 , 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 |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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]