Phosphomolybdic acid hydrate (CAS 51429-74-4)

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Synonym:	Molydophosphoric acid
Application:	A reagent used for spectrophotometric determination of phosphate ions
CAS Number:	51429-74-4
Molecular Weight:	1843.27
Molecular Formula:	H₃PO₄•12MoO₃•xH₂O

Ordering Information

Product Name	Catalog #	Unit	Price	Qty	Add
Phosphomolybdic acid hydrate	sc-215711	25 g	$63
Phosphomolybdic acid hydrate	sc-215711A	100 g	$136

This is classified as a Dangerous Good for transport and may be subject to additional shipping charges.

Description

Phosphomolybdic acid (PMA) hydrate is primarily used in spectrophotometric determination of phosphate ions. PMA is a component in the 3-color histology stain called Masson’s trichrome; employed in the differentiation step, Phosphomolybdic acid is one of the solutions fixed tissues are immersed in prior to subsequent staining. Phosphomolybdic acid is also used as reagent for simple and rapid colorimetric determination of phenothiazine derivatives. PMA oxidizes the phenothiazine derivative to a cationic free radical, forming a coloured salt. A preliminary extraction is necessary if certain reductants (sulphite or ascorbic acid) are present as stabilizers, as they will reduce the reagent to phosphomolybdenum blue.
Also available in solution: Phosphomolybdic acid solution (sc-203346)

Technical Information

Appearance:	Yellow to Yellow With an Orange Cast Powder and/or Crystals
Physical State:	Solid
Solubility:	Soluble in water, ethanol, and ether.
Storage:	Store at room temperature
Melting Point:	78-98 °C (Predicted)
Density:	1.62 g/cm³ at 25 °C (lit.)

Safety and Reference Information

Transport:	UN 3085, Class 5.1, Packing group III
WGK Germany:	3
PubChem CID:	16211564
Merck Index:	14: 7342
MDL Number:	MFCD00149913
EC Number:	234-713-5
SMILES:	O.OP(=O)(O)O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)= O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O)=O.O=[Mo](=O )=O.O=[Mo](=O)=O

For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.

References

1. Fujinaga, T., et al. 1971. Talanta. 18: 960-962. PMID: 18960967
2. Stan, M., et al. 1977. Talanta. 24: 140-142. PMID: 18962047
3. Li, Y., et al. 2009. Org. Lett. 11: 2691-2694. PMID: 19514796

SDS

Datasheet/SDS