Sodium hexametaphosphate
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Sodium hexametaphosphate (SHMP) is a salt of composition Na6[(PO3)6].[3] Sodium hexametaphosphate of commerce is typically a mixture of metaphosphates (empirical formula: NaPO3), of which the hexamer is one, and is usually the compound referred to by this name. Such a mixture is more correctly termed sodium polymetaphosphate. They are white solids that dissolve in water.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
sodium cyclo-hexaphosphate | |
Other names
Calgon S Glassy sodium | |
Identifiers | |
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.030.299 |
EC Number |
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MeSH | sodium+polymetaphosphate |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
Na6[(PO3)6] | |
Molar mass | 611.7704 g mol−1 |
Appearance | White crystals |
Odor | odorless |
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 |
Refractive index (nD) |
1.482 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Irritant |
GHS labelling:[2] | |
Warning | |
H319 | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
3.053 g kg−1 |
Safety data sheet (SDS) | hazard.com |
Related compounds | |
Other anions |
Trisodium phosphate Tetrasodium pyrophosphate Pentasodium triphosphate |
Related compounds |
Sodium trimetaphosphate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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