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Molecular formula----- (NaPO3)6

Molar mass------ 611.77 g/mol

Appearance ------White, odorless, crystalline powder

Density ------2.484 g/cm3

Melting point ------550 °C

Boiling point ------1500 °C

Solubility in water ------soluble

Solubility in organic ------solvents insoluble

Sodium hexametaphosphate (SHMP) is a hexamer of composition (NaPO3)6.Sodium hexametaphosphate of commerce is typically a mixture of polymeric metaphosphates, of which the hexamer is one, and is usually the compound referred to by this name. It is more correctly termed sodium polymetaphosphate. It is prepared by melting monosodium orthophosphate, followed by rapid cooling. SHMP hydrolyzes in aqueous solution, particularly under acidic conditions, to sodium trimetaphosphate and sodium orthophosphate.