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Hexafluorosilicic acid
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<p>Hexafluorosilicic acid is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> H2SiF6. Aqueous solutions of hexafluorosilicic acid consist of salts of the cation and hexafluorosilicate anion. These salts and their aqueous solutions are colorless. </p><p>Hexafluorosilicic acid is produced naturally on a large scale in volcanoes. It is manufactured as a coproduct in the production of <a href="/facts/Phosphate_fertilizer/ysh3r6NJ">phosphate fertilizers</a>. The resulting hexafluorosilicic acid is almost exclusively consumed as a precursor to <a href="/facts/Aluminum_trifluoride/psF0WEqn">aluminum trifluoride</a> and <a href="/facts/Sodium_hexafluoroaluminate/qkmlSI9A">synthetic cryolite</a>, which are used in aluminium processing. Salts derived from hexafluorosilicic acid are called hexafluorosilicates. </p>