| CAS No.: | 12501-23-4 (hydrate); 1343-93-7 |
| Molecular Weight: | 2880.05 (anhydrous) g/mol |
| Chemical Formula | H3[P(W3O10)4]-xH2O |
Phosphotungstic acid (PTA), tungstophosphoric acid (TPA), is a heteropoly acid with the chemical formula H3PW12O40. It is normally present as a hydrate. In common with the other heteropolyacids phosphotungstic acid is a catalyst and its high acidity and thermal stability make it a catalyst of choice.
Specifications of Phospho Tungstic Acid Hydrate:
MF: H3[P(W3O10)4] · xH2O
CAS Number: 12501-23-4
Assay: 98.5 to 99.5%
Status: White or cream colored cyrstals or crystalline powder
Color: Slightly Yellow-Green Crystals
Solubility: Water
pH: 1.5 to 2.0 %
Water Insolubles: 0.01 to 0.02 %
Loss On Drying: 13 to 17.
Insoluble: 50 ppm maximum
Chloride: 10 ppm
maximum
Sulfate:
10 ppm
maximum
Iron: 10 ppm
maximum.
