Sodium hexametaphosphate

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Sodium hexametaphosphate
Names
Other names
Calgon S
Glassy sodium
Graham's salt
Hexasodium metaphosphate
Metaphosphoric acid, hexasodium salt
SHMP
Sodium polymetaphosphate
Properties
(NaPO3)6
Molar mass 611.7704 g/mol
Appearance Crystalline solid
Density 2.484 g/cm3
Melting point 628 °C (1,162 °F; 901 K)
Boiling point 1,500 °C (2,730 °F; 1,770 K)
Soluble
Solubility Insoluble in organic solvents
Hazards
Safety data sheet Sigma-Aldrich
Lethal dose or concentration (LD, LC):
3,053 mg/kg (rat, oral)
Related compounds
Related compounds
Phosphoric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium hexametaphosphate or sodium polymetaphosphate is a chemical compound, a hexamer with the formula (NaPO3)6.

Properties

Chemical

Sodium hexametaphosphate hydrolyzes in aqueous solution, particularly under acidic conditions, to sodium trimetaphosphate and sodium orthophosphate.

Physical

Sodium hexametaphosphate is a crystalline solid.

Availability

Sodium hexametaphosphate is sold in many hardware stores as water deflocculant.

Preparation

Sodium hexametaphosphate can be made by dehydrating monosodium phosphate to sodium acid pyrophosphate and then to sodium hexametaphosphate.

Projects

Handling

Safety

Sodium hexametaphosphate has low toxicity and doesn't require special handling.

Storage

In closed bottles.

Disposal

No special disposal is required. Discard it as you wish.

References

Relevant Sciencemadness threads