7646. Potassium Metaphosphate

Nomenclature

CAS number: 7790-53-6
Potassium Kurrol's salt; potassium polymetaphosphate; potassium polyphosphate.

Description and references

(KPO3)x. High mol wt polymer; degree of polymerization dependent upon preparative conditions. Prepd by dehydration of KH2PO4: Pfansteil, Iler, J. Am. Chem. Soc. 74, 6059 (1952). Structural studies: Jost, Acta Crystallogr. 16, 623 (1963); Jost, Schulze, ibid. 25B, 1110 (1969); eidem, ibid. 27B, 1345 (1971). Reviews of metaphosphates: J. R. Van Wazer, Phosphorus and Its Compounds vol 1 (Interscience, New York, 1958) pp 601-678; Thilo, Adv. Inorg. Chem. Radiochem. 4, 1-75 (1962).

Properties

White, monoclinic crystals. d20 2.45. Insol in pure water. Sol in aq solns of alkali metal (except potassium) salts.