Sodium hexametaphosphate

Sodium hexametaphosphate
Names
	IUPAC name sodium cyclo-hexaphosphate
	Other names Calgon S; Glassy sodium; Graham's salt; Hexasodium metaphosphate; Metaphosphoric acid, hexasodium salt
Identifiers
CAS Number	68915-31-1 [EPA];
3D model (JSmol)	Interactive image;
ChemSpider	23340 ;
ECHA InfoCard	100.030.299
EC Number	233-343-1;
MeSH	sodium+polymetaphosphate
PubChem CID	24968;
UNII	N40N91DW96;
CompTox Dashboard (EPA)	DTXSID1047522 ;
	InChI 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 Key: GCLGEJMYGQKIIW-UHFFFAOYSA-H ;
	SMILES [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
Chemical formula	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)
Solubility in water	soluble
Solubility	insoluble in organic solvents
Refractive index (nD)	1.482
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	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). verify (what is ?) Infobox references

Sodium hexametaphosphate (SHMP) is a salt of composition Na₆[(PO₃)₆]. 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.

Names



IUPAC name sodium cyclo-hexaphosphate
Other names Calgon S Glassy sodium Graham's salt Hexasodium metaphosphate Metaphosphoric acid, hexasodium salt
Identifiers
CAS Number	68915-31-1^N[EPA]
3D model (JSmol)	Interactive image
ChemSpider	23340^Y
ECHA InfoCard	100.030.299
EC Number	233-343-1
MeSH	sodium+polymetaphosphate
PubChem CID	24968
UNII	N40N91DW96
CompTox Dashboard (EPA)	DTXSID1047522
InChI 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
SMILES [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
Chemical formula	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)
Solubility in water	soluble
Solubility	insoluble in organic solvents
Refractive index (n_D)	1.482
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Irritant
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	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). N verify (what is ^YN ?) Infobox references