Weak Acid/Base Reactions (reversible buffer reactions) Weak acid/weak base reactions are simply proton ping .Pong . Weak acid (and conjugate acid) lose their H+ . Weak base (and conjugate base) gain an H+ . Water, being amphiprotic, will play the role of the acid or the base, as needed . Be able to label the: Weak acid Weak base Conjugate acid Conjugate base