Sodium fluorosilicate

Sodium fluorosilicate

Names
Preferred IUPAC name Sodium fluorosilicate
Systematic IUPAC name Sodium hexafluoridosilicate(2–)
Other names Disodium hexafluorosilicate/sodium fluosilicate/sodium silicofluoride
Identifiers
CAS Number	16893-85-9 Y
ChemSpider	26165 Y
EC Number	240-934-8
Jmol 3D model	Interactive image
PubChem	28127
RTECS number	VV8410000
UN number	2674
InChI InChI=1S/F6Si.2Na/c1-7(2,3,4,5)6;;/q-2;2*+1 Key: TWGUZEUZLCYTCG-UHFFFAOYSA-N
SMILES [Na+].[Na+].F[Si--](F)(F)(F)(F)F
Properties
Chemical formula	Na2[SiF6]
Appearance	white granular powder
Odor	odorless
Density	2.7 g/cm3
Solubility in water	0.64 g/100 mL (20 °C) 1.27 g/100 mL (50 °C) 2.45 g/100 mL (100 °C)
Solubility	insoluble in alcohol
Refractive index (nD)	1.312
Structure
Crystal structure	hexagonal
Vapor pressure	{{{value}}}
Related compounds
Other cations	Ammonium hexafluorosilicate Fluorosilicic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium fluorosilicate is a compound with the chemical formula Na₂[SiF₆].

Manufacturing

Sodium fluorosilicate is made by neutralizing fluorosilicic acid with sodium chloride or sodium sulfate.

Possible Application

It is used in some countries as additives for water fluoridation, opal glass raw material, ore refining, or other fluoride chemical (like sodium fluoride, magnesium silicofluoride, cryolite, aluminum fluoride) production.

See also

• Fluorosilicic acid
• Ammonium fluorosilicate