Sodium orthosilicate

Sodium orthosilicate is the chemical compound with the molecular formula Na
₄SiO
₄. It is one of the sodium silicates, specifically an orthosilicate, formally a salt of the unstable orthosilicic acid H
₄SiO
₄.^[2][3][4]

Sodium orthosilicate

Chemical structure of sodium orthosilicate
Names
IUPAC name Tetrasodium silicate
Other names Sodium orthosilicate
Identifiers
CAS Number	13472-30-5 N
3D model (JSmol)	Interactive image
ChemSpider	24265 Y
ECHA InfoCard	100.033.387
EC Number	236-741-3
PubChem CID	26051
UNII	TEU2JIC5PA N
UN number	1759
CompTox Dashboard (EPA)	DTXSID6065501
InChI InChI=1S/4Na.O4Si/c;;;;1-5(2,3)4/q4*+1;-4 Y Key: POWFTOSLLWLEBN-UHFFFAOYSA-N Y InChI=1S/4Na.O4Si/c;;;;1-5(2,3)4/q4*+1;-4 Key: POWFTOSLLWLEBN-UHFFFAOYSA-N
SMILES [O-][Si]([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+]
Properties
Chemical formula	Na4O4Si
Molar mass	184.040 g·mol−1
Appearance	White powder
Melting point	1,018 °C (1,864 °F; 1,291 K)
Hazards
GHS labelling:[1]
Pictograms
Signal word	Danger
Hazard statements	H302, H314, H335
Precautionary statements	P260, P301+P330+P331, P303+P361+P353, P305+P351+P338, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N (what is YN ?) Infobox references

Uses

Sodium orthosilicate has been considered as an interfacial tension reducing additive in the waterflooding of oil fields for enhanced oil extraction. In laboratory settings, it was found to be more effective than sodium hydroxide for some types of oil.^[5]

Sodium orthosilicate has been found to stabilize ferrate films as an anticorrosion treatment of iron and steel surfaces.^[6]

Natural occurrence

Sodium orthosilicate has not been found in nature. However, the mineral chesnokovite, chemically the related salt disodium dihydrogen orthosilicate Na₂SiO₂(OH)₂·8H₂O, was identified in the Kola Peninsula in 2007.^[7]

See also

• Sodium metasilicate, Na
  ₂SiO
  ₃