Like sulfuric acid, this 
Like sulfuric acid, this substance is used as a catalyst in the alkylation of isobutane. When used with antimony trifluoride to treat chloroform, Teflon is created. This chemical is prepared by reacting its anion's namesake mineral with sulfuric acid, or as a byproduct in the creation of phosphoric acid. It does not completely dissociate in water, so it penetrates skin very easily, reacting with calcium to dissolve bone. Because of the very low entropy of hydration for its anion, despite being incredibly corrosive, it is a weak acid; that high strength comes from the strongest-known bond with hydrogen. Stored in Teflon containers, name this haloacid used to etch glass, with formula HF.
Like sulfuric acid, this substance is used as a catalyst in the alkylation of isobutane.
{hydrofluoric} acid [accept {HF} before the end; accept aqueous {hydrogen fluoride}]