Lithium hexafluorosilicate
| Names | |
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| IUPAC name
dilithium; hexafluorosilicon(2-)
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| Other names
Dilithium hexafluorosilicate
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| F6Li2Si | |
| Molar mass | 155.96 g·mol−1 |
| Appearance | White powder |
| Density | 2.33 g/cm3 |
| soluble | |
| Hazards | |
| GHS labelling: | |
| GHS07: Exclamation mark | |
| Warning | |
| H302 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Lithium hexafluorosilicate is an inorganic chemical compound with the chemical formula Li2SiF6.[1][2]
Synthesis
[edit | edit source]Lithium hexafluorosilicate can be obtained by reacting hexafluorosilicic acid with lithium hydroxide or lithium carbonate or by reacting silicon tetrafluoride with lithium fluoride.[3]
- H2[SiF6] + 2LiOH → Li2[SiF6] + 2H2O
Physical properties
[edit | edit source]Lithium hexafluorosilicate is a white, odorless solid that is soluble in water and methanol. When heated above 250 °C, it decomposes into lithium fluoride and silicon(IV) fluoride. It has a trigonal crystal structure with the space group P 321 (space group no. 150) and three formula units per unit cell, isotypic to sodium hexafluorosilicate.[4][5]
Uses
[edit | edit source]Lithium hexafluorosilicate is used as an intermediate in the manufacture of pharmaceuticals and other chemical compounds. It is also an intermediate in the preparation of lithium chloride from lithium-containing minerals by reacting with hexafluorosilicic acid.[citation needed]
References
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