Fluoroantimonic acid

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Fluoroantimonic acid is a mixture of hydrogen fluoride and Antimony pentafluoride. This chemical is a superacid that can be more than 1015 times stronger than pure sulfuric acid, with pH generally dependent on the ratios of hydrogen fluoride and antimony pentafluoride. It is reported to have a pH of -31.3. Extreme care must be taken when handling and storing fluoro­antimonic acid; it is more than corrosive enough to dissolve ordinarily corrosion-resistant materials, including glass. It is generally stored in PTFE-coated (commonly known as Teflon) containers, as only the fluoride-carbon bonds in PTFE are strong enough to resist protonation from fluoroantimonic acid.