Inside chemistry labs, chemists work with what they call superacids. No one’s found a specific use for such a fantastically strong acid yet, but chemists are actively looking for one.

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Sources:
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A few popular sources say fluoroantimonic acid’s Hammett acidity function is -31.3 (https://en.wikipedia.org/wiki/Fluoroantimonic_acid, http://www.realclearscience.com/blog/2013/08/the-worlds-strongest-acids.html), but actually it’s only -28: http://pubs.acs.org/doi/pdf/10.1021/jo040285o
http://www.sciencelab.com/msds.php?msdsId=9924285
http://www.realclearscience.com/blog/2013/08/the-worlds-strongest-acids.html
https://www.degruyter.com/view/j/pac.1977.49.issue-1/pac197749010107/pac197749010107.xml
http://www.org-chem.org/yuuki/acid/acid_en.html
http://pubs.acs.org/doi/pdf/10.1021/ja01571a016
https://books.google.com/books?id=poO9RHq-IoIC&pg=PA150#v=onepage&q&f=false