Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Hexafluorosilicic acid is an inorganic compound with the chemical formula H 2SiF 6. Aqueous solutions of hexafluorosilicic acid consist of salts of the cation and hexafluorosilicate anion. These salts and their aqueous solutions are colorless.
Hexafluorosilicic acid is produced naturally on a large scale in volcanoes.[1][2] It is manufactured as a coproduct in the production of phosphate fertilizers. The resulting hexafluorosilicic acid is almost exclusively consumed as a precursor to aluminum trifluoride and synthetic cryolite, which are used in aluminium processing. Salts derived from hexafluorosilicic acid are called hexafluorosilicates.
^Palache, C., Berman, H., and Frondel, C. (1951) Dana’s System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, etc. John Wiley and Sons, Inc., New York, 7th edition.
^Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1997) Handbook of Mineralogy, Volume III: Halides, Hydroxides, Oxides. Mineral Data Publishing, Tucson.
Bararite
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Hexafluorosilicicacid is an inorganic compound with the chemical formula H 2SiF 6. Aqueous solutions of hexafluorosilicicacid consist of salts of the...
co-mingled with the phosphate ores to produce hexafluorosilicicacid (H2SiF6). The majority of the hexafluorosilicicacid is converted to aluminium fluoride and...
standard by which other water-fluoridation compounds are gauged, hexafluorosilicicacid (H2SiF6) and its salt sodium hexafluorosilicate (Na2SiF6) are more...
the phosphate rocks. The hydrofluoric acid and silicon dioxide (SiO2) react to produce hexafluorosilicicacid: 6 HF + SiO2 → H2SiF6 + 2 H2O In the laboratory...
is a byproduct of fertilizer production, which generates hexafluorosilicicacid. This acid can be degraded to release HF thermally and by hydrolysis:...
intermediate in the production of hydrofluoric acid from hexafluorosilicicacid. Thus, hexafluorosilicicacid is hydrolyzed to give ammonium fluoride, which...
produced by treating alumina with hydrogen fluoride at 700 °C: Hexafluorosilicicacid may also be used make aluminium fluoride. H2[SiF6] + Al2O3 + 3 H2O...
translucent surface. Acid etching is done using hexafluorosilicicacid (H2SiF6) which, when anhydrous, is colourless. The acid can be prepared by mixing...
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silicon dioxide are attacked ("etched") by hydrofluoric acid (HF) to produce hexafluorosilicicacid: SiO2 + 6 HF → H2SiF6 + 2 H2O Stishovite does not react...
manufactured HF is a byproduct of fertilizer production, which produces hexafluorosilicicacid (H2SiF6), which can be degraded to release HF thermally and by hydrolysis:...
in small quantities. List of minerals Thermal history modelling Hexafluorosilicicacid Hydroxyapatite in bone Warr, L.N. (2021). "IMA–CNMNC approved mineral...
this process is a mixture of lead fluorosilicate ("PbSiF6") and hexafluorosilicicacid (H2SiF6) operating at 45 °C (113 °F). Cathodes are thin sheets of...
the U.S., fluoridation is usually accomplished by the addition of hexafluorosilicicacid, which decomposes in water, yielding fluoride ions. Water conditioning:...
hygiene. Originally, sodium fluoride was used to fluoridate water; hexafluorosilicicacid (H2SiF6) and its salt sodium hexafluorosilicate (Na2SiF6) are more...
silicon oxide orthophosphate Si5O(PO4)6, and with hydrofluoric acid to give hexafluorosilicicacid H2SiF6. The latter reaction "is sometimes quoted as evidence...
Wikimedia Commons has media related to Diammonium hexafluorosilicate. Hexafluorosilicicacid Sodium fluorosilicate ammonium silicofluoride "Ammonium Hexafluorosilicate"...
Hexafluorotitanic acid (systematically named oxonium hexafluoridotitanate(2-)) is an inorganic compound with the chemical formula (H3O)(H5O2)[TiF6]. According...
[SiF6]2−. Other calcium silicate hydrate (C-S-H) minerals: Afwillite Hexafluorosilicicacid, a chemical species with a central hexacoordinated octahedral silicon...
with sodium hydroxide (NaOH) produced ammonia (NH3). The anions of hexafluorosilicicacid (H2SiF6) precipitated as potassium fluorosilicate (K2SiF6). Barium...
can be expensive. It is also known as hexafluorosilicic, hexafluosilicic, hydrofluosilicic, and silicofluoric acid. Sodium fluorosilicate (Na2SiF6) is the...
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