| Other names
Metaphosphoric acid, hexasodium salt
|Molar mass||611.7704 g/mol|
|Melting point||628 °C (1,162 °F; 901 K)|
|Boiling point||1,500 °C (2,730 °F; 1,770 K)|
|Solubility||Insoluble in organic solvents|
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|3,053 mg/kg (rat, oral)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Sodium hexametaphosphate or sodium polymetaphosphate is a chemical compound, a hexamer with the formula (NaPO3)6.
Sodium hexametaphosphate hydrolyzes in aqueous solution, particularly under acidic conditions, to sodium trimetaphosphate and sodium orthophosphate.
Sodium hexametaphosphate is a hard crystalline solid, insoluble in most solvents.
Sodium hexametaphosphate is sold in many hardware stores as water deflocculant.
Sodium hexametaphosphate can be made by dehydrating monosodium phosphate to sodium acid pyrophosphate and then to sodium hexametaphosphate.
- Water filtration
- Make elemental phosphorus
Sodium hexametaphosphate has low toxicity and doesn't require special handling.
In closed bottles.
No special disposal is required. Discard it as you wish.