What is Fluoroantimonic acid?
'''Fluoroantimonic acid''' is a [[chemical substance]]. The [[acid]] is a mixture of [[hydrogen fluoride]] and [[Antimony pentafluoride]]. It is a liquid at 25 degrees Celsius at [[standard atmosphere]] (a specific pressure). This chemical is a [[superacid]] that can be more than 10<sup>16</sup> 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 [[Polytetrafluoroethylene|PTFE]]-coated (commonly known as Teflon) containers, as only the fluoride-carbon bonds in PTFE are strong enough to resist protonation from fluoroantimonic acid. Extreme corrosion is not the only hazard as it is highly unstable, oxidizing, poisonous and irritating. {{Chembox | container_only = | Section3 = {{Chembox Hazards | NFPA-H = 4 | NFPA-F = 0 | NFPA-R = 4 | NFPA-S = W+OX }} <nowiki>}}</nowiki> }} == Properties == === Acidity === Fluoroantimonic acid is often rated as around 10<sup>16</sup> times stronger than pure sulfuric acid, giving it one of the highest known acidities. === pH === This acid is so strong that it doesn't have a measurable pH value in the traditional sense, as it readily donates protons in virtually any environment. Hammett acidity function (H0) is the proper unit for measuring superacids stronger than Sulfuric acid (H0: -12). Fluoroantimonic acid's H0 strength is about -28. === Protonation Power === Fluoroantimonic acid can protonate even weak bases and hydrocarbons, which are typically non-reactive to most other acids. === Reactivity === Its extreme reactivity means it can corrode glass, metals, and most organic materials. However sometimes it's seen to corrode glass rather slowly, which might be due to impurities. It reacts violently and dehydrates cellulose based materials (paper or