545. Ammonium Phosphomolybdate

Nomenclature

CAS number: 12026-66-3
Tetracosa-μ-oxododecaoxo[μ12-[phosphato(3)-κO:κO:κO:κO′:κO′:κO′:κO″:κO″:κO″:κO′′′:κO′′′:κO′′′]]dodecamolybdate(3) ammonium (1:3); ammonium molybdophosphate.
H12Mo12N3O40P; mol wt 1876.35.
H 0.64%, Mo 61.36%, N 2.24%, O 34.11%, P 1.65%.
(NH4)3PO4.12MoO3.

Description and references

Prepn and constitution: Illingworth, Keggin, J. Chem. Soc. 1935, 575; Thistlewaite, Analyst 72, 531 (1947); Healy, Radiochim. Acta 3, 100 (1964).

Properties

Yellow, heavy, cryst powder. Solubility in water (20°): 0.2 ±0.1 g/l. Practically insol in nitric acid; sol in fixed alkali hydroxides.

Use

In phosphorus analysis; as cation-exchanger.