We're going to remember what PH is and we're going to remember what acidic and basic solutions are. So let's begin by recalling what an acid based reaction is. So an acidbase reaction is a reaction in which we exchange an H plus ion between two different molecules. So we have the acid molecule that donates an H plus ion and a bond is broken while the other molecule, the base, accepts that H plus ion because it has a lone pair of electrons and it forms a Covalent bond. So in an aft base reaction, we have an exchange of a proton. And the reason we say a proton is because a hydrogen ion lacks an electron and it only has a proton in the nucleus.