So suppose we have some ratio of HCL, some unknown in our solution and suppose we add that same amount of moles, of NaOH. Well, that means we're going to have a ratio one to one to one to one. And all these guys are going to reassociate to form water and NaCl. And what will happen then? Well, then our PH will become seven, right? And in fact, at this point, when the ratio of moles added is the same as the ratio of this guy, this point is called the equivalence point.