Now let's take a look at a strong base strong acid titration curve. We can see here that this also has a sigmoidal shape, but it's going the opposite direction. We can see that we're starting out at a pH that's well above 7. Since we're starting out a pH that's well above 7, that must mean our titrate is a strong base. And here we're adding our titrant over time and that's causing a decrease in our pH. So our type trend here would be a strong acid.

So here we can see that our pH starts above 7 since we have a strong base to begin with and it decreases sharply with added acid. Now here we look at the steepest drop, the steepest drop in terms of RPH. It happens here gives us this red dot, which is our equivalence point. It too would give us a pH equal to seven at the equivalence point. So keep this in mind. When both the titrate and titrate are strong, the pH will be equal to seven at the equivalence point, like regardless of who's the titrate and who's the titrate, because again, it's based on strength. Since they're both strong, it's kind of like a draw. So their pH is equal to 7 at the equivalence point.

Now after the equivalence point. So we're talking about this portion here. We see that the strong base has been completely neutralized and access strong acid remains. So when we get to the equivalence point, all of these strong acid has destroyed all of the strong base, but we continue to add more and more strong acid. So that's why our pH continues to drop. Eventually it will level off and we see here that it's leveling off around a pH of 1.

So just remember, in both cases we have a sigmoidal shape because both the app does titrate and titrate are strong species. Because they're both strong, the pH is equal to 7 at the equivalence point, right? So just keep in mind the similarities between these two types of titration curves.