And for NaOH and HCL, for a strong acid and strong base, this is a PH of seven. So we see that this point is the point at which we add enough Maoh that our ratio begins to equal out. Our ratio becomes closer and closer to one and one. And as we add more, as we get closer to a ratio of one to one, we get closer to our PH of seven. And that's why we see this large increase in PH. Now, if we begin to add more of our sodium hydroxide, our solution becomes basic.