Phosphomolybdic acid
From Wikipedia, the free encyclopedia
| Phosphomolybdic acid | ||
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| Other names Molybdophosphoric acid; dodecamolybdophosphoric acid | ||
| Identifiers | ||
| CAS number | 12026-57-2  , 51429-74-4 (hydrate) | |
| PubChem | 53384541 | |
| EC number | 234-713-5 | |
| MeSH | Phosphomolybdic+acid | |
| Properties | ||
| Molecular formula | H3PMo12O40 | |
| Molar mass | 1825.25 g/mol | |
| Density | 0.94 g/ml | |
| Boiling point | 158 °C; 316 °F; 431 K | |
| Hazards | ||
| EU Index | Not listed | |
| Main hazards | Flammable | |
| Flash point | 5 °C; 41 °F; 278 K | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 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 color intensifies with increasing number of double bonds in the molecule being stained.[1]
See also
- Phosphotungstic acid
- Folin-Ciocalteu reagent
References
- ↑ Reduction of Phosphomolybdic Acid by Compounds Possessing Conjugated Double Bonds, S. Burstein, Anal. Chem., 1953, 25 (3), pp 422–424
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