Sodium fluorosilicate
From Wikipedia the free encyclopedia
 Unit cell of sodium hexafluoridosilicate | |
| Names | |
|---|---|
| Preferred IUPAC name Sodium fluorosilicate | |
| Systematic IUPAC name Sodium hexafluoridosilicate(2–) [1] | |
| Other names Disodium hexafluorosilicate/sodium fluosilicate/sodium silicofluoride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.037.198 |
| EC Number |
|
PubChem CID | |
| RTECS number |
|
| UNII | |
| UN number | 2674 |
CompTox Dashboard (EPA) | |
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| |
| Properties | |
| 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) | 1.312 |
| Structure[2] | |
| trigonal | |
| P321 | |
a = 8.859, c = 5.038 | |
Formula units (Z) | 4 |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LDLo (lowest published) | 70 mg/kg (mouse, oral) 125 mg/kg (rabbit, oral)[3] |
| Related compounds | |
Other cations | Ammonium hexafluorosilicate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Sodium fluorosilicate is a compound with the chemical formula Na2[SiF6]. Unlike other sodium salts, it has a low solubility in water.
Natural occurrence[edit]
Sodium hexafluorosilicate occurs naturally as the rare mineral malladrite found within some volcanic fumaroles.[4]
Manufacturing[edit]
Sodium fluorosilicate is made by neutralizing fluorosilicic acid with sodium chloride or sodium sulfate.
- H2[SiF6] + 2 NaCl → Na2[SiF6] + 2 HCl
Possible application[edit]
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[edit]
References[edit]
- ^ "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. Bibcode:1964AcCry..17.1408Z. doi:10.1107/S0365110X64003516.
{{cite journal}}: 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).
- ^ "Malladrite".
- ^ "PUB". Archived from the original on 2009-03-26. Retrieved 2009-08-10.