Phosphomolybdic acid

Phosphomolybdic acid
Phosphomolybdic acid
Other names
Molybdophosphoric acid; dodecamolybdophosphoric acid
Identifiers
CAS number 12026-57-2 YesY, 
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
 YesY acid (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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 colour intensifies with increasing number of double bonds in the molecule being stained.[1]

See also

References

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

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • phosphomolybdic acid — phos·pho·mo·lyb·dic acid mə .lib dik n any of several acids obtainable from solutions of phosphoric acid and molybdic acid and used chiefly as precipitants (as for alkaloids) esp the yellow crystalline acid H3PMo12O40·xH2O containing twelve atoms …   Medical dictionary

  • phosphomolybdic acid — “+... noun Etymology: International Scientific Vocabulary phosph + molybdic : any of several heteropoly acids obtainable from solutions of phosphoric acid and molybdic acid and used chiefly as precipitants (as for alkaloids and for basic dyes for …   Useful english dictionary

  • phosphomolybdic acid — noun A yellow green compound used as a reagent in thin layer chromatography …   Wiktionary

  • Phosphotungstic acid — Chembox new Name = Phosphotungstic acid ImageFile = Phosphotungstate 3D polyhedra.png ImageName = Structure of the phosphotungstate anion OtherNames = PTA, TPA, tungstophosphoric acid Section1 = Chembox Identifiers CASNo = 12067 99 1 Section2 =… …   Wikipedia

  • Periodic acid-Schiff stain — Periodic acid Periodic acid Schiff (PAS) is a staining method used to detect glycogen and other polysaccharides in tissues. The reaction of periodic acid oxidizes the diol functional groups in glucose and other sugars, creating aldehydes that… …   Wikipedia

  • molybdic acid — noun 1. : any of various acids derived from molybdenum trioxide; especially : the simplest acid H2MoO4 obtained as white crystals or as the yellow crystalline monohydrate H2MoO4.H2O but known chiefly in the form of salts many of which are… …   Useful english dictionary

  • molybdophosphoric acid — “+... noun Etymology: International Scientific Vocabulary molybd + phosphoric : phosphomolybdic acid …   Useful english dictionary

  • Keggin structure — is the best known structural form for heteropoly acids. It is the structural form of α–Keggin anions, which have a general formula of [XM12O40] n , where X is the heteroatom (most commonly are P5+, Si4+, or B3+), M is the addenda atom (most… …   Wikipedia

  • Masson's trichrome stain — of rat airway. Connective tissue is stained blue, nuclei are stained dark red/purple, and cytoplasm is stained red/pink. Masson s trichrome is a three colour staining protocol used in histology. The recipes evolved from Claude L. Pierre Masson s… …   Wikipedia

  • Molybdatophosphorsäure — Strukturformel Allgemeines Name Molybdatophosphorsäure Andere Namen …   Deutsch Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”