Fluoride anion and hydronium cation react to form hydrofluoric acid and water, like this:
F-(aq)+H3O+(aq)=HF(aq)+H2O(l)
At a certain temperature, a chemist finds that a reaction vessel containing an aqueous solution of fluoride anion, hydronium cation, hydrofluoric acid, and water at equilibrium has the following composition:
