Hello. So today we'll be looking at I Trey, Trey Shin off hydrochloric acid, which is a strong acid, and Mazzella mean, which is a weak base. So what happens when we reached the equivalents Point? Well, at the equivalents point all of this week, base will be converted to the conjugal acid. So what will be the P H at the equivalents point, while everything has been converted to the conjugal acid and the Hakan ticket acid is going to react with water partially to reform the conjugate base and form hydro knee, um, I on. So first, let's try to figure out what the of initial concentration off this weak ass it is while we don't know the volume or the multi moles that we start out with, but we do know the concentration. So say hypothetically that we had one the leader off this weak base metal mean so we had 0.2 moles of it. Well, we would need one leader of hydrochloric acid to react with methyl amine to form the contract acid, so we would have this. So the 0.2 moles of methyl amine would become pope 0.2 moles off the con jacket acid, and we would end up with two leaders as the volume. So we would divide eso the it becomes more dilute. So it would end up with zero 0.10 polarity of this acid. And if you take a look, you'll notice that it doesn't matter what concentration you start off each, you start out with, you will always get that it's going to end up being 0.1 molar ity. And then we have zero of the Mesilla mean and the hydro Nehemiah is about zero because technically, it's 10 to the negative seven. But this is very small Suijk and consider it negligible. So then this acid will react to create one mole of this acid will react to create one mole of the conjugated basin, one mole of hydro knee, um, violence. And so we will see one bullet, one mole arat e 0.1 mole Araji subtracting the change. But this change is very, very small compared to this 0.1. So we will just approximate it as 0.10 molar ity and then the methyl amine in the high droney amiss simply acts. Now the k a for this acid is 2.3 times 10 to negative 11. And the K is the conjugate base, which is Mesilla mean times the hi dhoni, um, over the acid. So you'll notice that it's equal to X squared over 0.1. And so, if you just rearrange this, you'll get X squared is equal to 2.3 times 10 to the negative 12. So we simply take the square root of both sides, and we will see that X is equal to 1.5 times to tend to the negative six. Similarity. So now this is equal to the hydro knee, Um, concentration. So if we finally want to find out the pH. The pH is the negative log with the hydro knee, um, concentration, which is the negative log of 1.5 times 10 to negative six, So the pH is five 0.8.