Sodium hexametaphosphate

Sodium hexametaphosphate[1]
Skeletal formula of sodium hexametaphosphate
Names
IUPAC name
sodium cyclo-hexaphosphate
Other names
Calgon S

Glassy sodium
Graham's salt
Hexasodium metaphosphate

Metaphosphoric acid, hexasodium salt
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.299 Edit this at Wikidata
EC Number
  • 233-343-1
MeSH sodium+polymetaphosphate
UNII
  • InChI=1S/6Na.H6O18P6/c;;;;;;1-19(2)13-20(3,4)15-22(7,8)17-24(11,12)18-23(9,10)16-21(5,6)14-19/h;;;;;;(H,1,2)(H,3,4)(H,5,6)(H,7,8)(H,9,10)(H,11,12)/q6*+1;/p-6 ☒N
    Key: GCLGEJMYGQKIIW-UHFFFAOYSA-H ☒N
  • [O-]P1(=O)OP(=O)([O-])OP(=O)([O-])OP(=O)(OP(=O)(OP(=O)(O1)[O-])[O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+]
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
1.482
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Irritant
GHS labelling:[2]
GHS07: Exclamation mark
Warning
H319
Lethal dose or concentration (LD, LC):
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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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.

  1. ^ Merck Index, 12th Edition, Sodium polymetaphosphate, 8814
  2. ^ "C&L Inventory". echa.europa.eu.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 530. ISBN 978-0-08-037941-8.