Phosphomolybdic acid
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| Names | |
|---|---|
| Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid
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| Identifiers | |
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| ECHA InfoCard | 100.031.544 |
| EC Number |
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| MeSH | Phosphomolybdic+acid |
PubChem CID
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| Properties | |
| H3PMo12O40 | |
| Molar mass | 1825.25 g/mol |
| Density | 1.62 g/ml[1] (hydrate) |
| Melting point | 79-90 °C[1] |
| soluble | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Oxidiser[1] (hydrate) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
- ^ a b c http://www.sigmaaldrich.com/MSDS/MSDS/DisplayMSDSPage.do?country=US&language=en&productNumber=221856&brand=SIAL&PageToGoToURL=http%3A%2F%2Fwww.sigmaaldrich.com%2Fcatalog%2Fsearch%3Fterm%3DPhosphomolybdic%2Bacid%26interface%3DAll%26N%3D0%26mode%3Dmatch%2520partialmax%26lang%3Den%26region%3DUS%26focus%3Dproduct. Retrieved 25 November 2015.
{{cite web}}: Missing or empty|title=(help) - ^ Reduction of Phosphomolybdic Acid by Compounds Possessing Conjugated Double Bonds, S. Burstein, Anal. Chem., 1953, 25 (3), pp 422–424
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