Hexafluorotitanic acid (systematically named oxonium hexafluoridotitanate(2-)) is an inorganic compound with the chemical formula (H3O)(H5O2)[TiF6]. According to X-ray crystallography, the salt consists of [TiF6]2- octahedral and two kinds of oxonium cations, (H3O)+ and (H5O2)+.
As with most oxonium salts, it is only stable in acidic solution. Under basic conditions, closely related salts hydrolyse to a hydrated titanium dioxide:
A related salt is the anhydrous fluoronium hexafluoridotitanate(2-) or (H2F)2[TiF6].
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