Sodium pyrosilicate

Sodium pyrosilicate
Names
	Other names hexasodium diorthosilicate
Identifiers
CAS Number	15593-82-5 ;
3D model (JSmol)	Interactive image;
EC Number	239-671-1;
PubChem CID	61803;
UNII	VNJ6H8MB6Z ;
	InChI InChI=1S/6Na.O7Si2/c;;;;;;1-8(2,3)7-9(4,5)6/q6*+1;-6 Key: PMYUVOOOQDGQNW-UHFFFAOYSA-N;
	SMILES [Si](O[Si]([O-])([O-])[O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+];
Properties
Chemical formula	Na6O7Si2
Molar mass	306.102 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). (what is ?) Infobox references

Sodium pyrosilicate is the chemical compound Na
₆Si
₂O
₇. It is one of the sodium silicates, specifically a pyrosilicate, formally a salt of the unstable pyrosilicic acid H
₆Si
₂O
₇.^[1]^[2]

^ Myron C Waddell (1932): "Process of purifying technical sodium pyrosilicate hydrates". US patent US1931364A.
^ J. F. Schairer and N. L. Bowen (1956): "The system Na
₂O—Al
₂O
₃—SiO
₂". American Journal of Science, volume 254, issue 3, pages 129-195 doi:10.2475/ajs.254.3.129