Sodium fluorosilicate
![]() Unit cell of sodium hexafluoridosilicate
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Names | |
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Preferred IUPAC name
Sodium fluorosilicate | |
Systematic IUPAC name
Sodium hexafluoridosilicate(2–)
[1] | |
Other names
Disodium hexafluorosilicate/sodium fluosilicate/sodium silicofluoride
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Identifiers | |
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3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.037.198 ![]() |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
UN number | 2674 |
CompTox Dashboard (EPA)
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Properties | |
Chemical formula
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Na2[SiF6] |
Molar mass | 188 g/mol |
Appearance | white granular powder |
Odor | odorless |
Density | 2.7 g/cm3 |
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)
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1.312 |
Structure[2] | |
Crystal structure
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trigonal |
Space group
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P321 |
a = 8.859, c = 5.038
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Formula units (Z)
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4 |
Hazards | |
NFPA 704 (fire diamond) | ![]()
2
0
0 |
Lethal dose or concentration (LD, LC): | |
LDLo (lowest published)
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70 mg/kg (mouse, oral) 125 mg/kg (rabbit, oral)[3] |
Related compounds | |
Other cations
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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].
Natural occurrence[]
Sodium hexafluorosilicate occurs naturally as the rare mineral malladrite found within some volcanic fumaroles.[4]
Manufacturing[]
Sodium fluorosilicate is made by neutralizing fluorosilicic acid with sodium chloride or sodium sulfate.
- H2[SiF6] + 2 NaCl → Na2[SiF6] + 2 HCl
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.[5]
See also[]
- Fluorosilicic acid
- Ammonium fluorosilicate
References[]
- ^ "Parent Hydride Names and Substitutive Nomenclature". Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005 (PDF). RSC Publishing. 2005. pp. 114–135.
- ^ Allan Zalkin, J. D. Forrester, David H. Templeton (1964). "The Crystal Structure of Sodium Fluorosilicate". Acta Crystallographica. 17 (11): 1408–1412. doi:10.1107/S0365110X64003516.CS1 maint: multiple names: authors list (link)
- ^ "Fluorides (as F)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^ https://www.mindat.org/min-2554.html
- ^ "Archived copy". Archived from the original on 2009-03-26. Retrieved 2009-08-10.CS1 maint: archived copy as title (link)
Categories:
- Sodium compounds
- Hexafluorosilicates