Phosphomolybdic acid
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| Names | |
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| Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid
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| Identifiers | |
12026-57-2  51429-74-4 (hydrate) 
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| ECHA InfoCard | 100.130.014 |
| EC Number | 234-713-5 |
| MeSH | Phosphomolybdic+acid |
| PubChem | 53384541 |
| Properties | |
| H3PMo12O40 | |
| Molar mass | 1825.25 g/mol |
| Density | 1.62 g/ml (hydrate) |
| Melting point | 79-90 °C |
| soluble | |
| Hazards | |
| Main hazards | Oxidiser (hydrate) |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is ?) |
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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 color intensifies with increasing number of double bonds in the molecule being stained.
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