Sodium fluorosilicate

Sodium fluorosilicate
	Unit cell of sodium hexafluoridosilicate
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 ;
3D model (JSmol)	Interactive image;
ChemSpider	26165 ;
ECHA InfoCard	100.037.198
EC Number	240-934-8;
PubChem CID	28127;
RTECS number	VV8410000;
UNII	806AV2E065 ;
UN number	2674
CompTox Dashboard (EPA)	DTXSID9036933 ;
	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]
Molar mass	188 g/mol
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	trigonal
Space group	P321
Lattice constant	a = 8.859, c = 5.038
Formula units (Z)	4
Hazards
NFPA 704 (fire diamond)	2 0 0
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	70 mg/kg (mouse, oral); 125 mg/kg (rabbit, oral)
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]. Unlike other sodium salts, it has a low solubility in water.

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Natural occurrence