 Okay, so this one says what's the, this is exactly the same as the last problem we did Except different compound So it says what is the molar solubility of lead 2 chloride With a Ksp of 1.6 times 10 to the 6th Okay, so first thing we have to do is write the chemical equation, right? So lead 2 chloride, do you remember? CL2, very good, equilibrium So it's going to be here PB2 plus And can we figure out the equation for the Ksp? From that chemical equation there? The concentration of lead ions times the concentration of chloride Squared, right? And so we know Ksp, so this here equals that, there Okay, and We are looking for, and I didn't believe it said the molar solubility because that's what I'm looking for And remember the molar solubility moles per liter, right? Okay, and that's the molar solubility we want to think of lead 2 chloride, okay? And remember what we were kind of thinking is kind of like the concentration of lead 2 chloride, right? So if we know that, then we know that and that's two times that, right? Okay, so this, but Going back to it, we don't know that, that's what we're trying to figure out, right? So The ratio of this to this to this, okay? So what we can do, so if we're, we need to figure out what these concentrations are But we can figure them out relatively So the concentration of lead, if we just say that that's X, right? Or whatever your favorite variable is concentration of Cl What does that have to be? 2 X, right? Where did you get that from? Well, you got it from the coefficient here because for every one lead There's two of these, right? So now we know those relative concentrations from the chemical equation and we can plug them into this equation here Okay, so what do we've got? We've got the Ksp equals X times 2 X All of it squared, right? So let's Solve for X, okay? So solving for X, we're going to get, well on this side Ksp and We'll just say X and we'll do this function. So 2 squared is 4 X squared is That X squared, right? You got that? Okay, so 4 X squared times X is it going to be X cubed, right? 4 X cubed, right? So that's going to equal 4 X cubed Equals Ksp So X cubed is going to be Ksp divided by 4 And if we wanted to So let's do it this time to the one-third, okay? We'll show it Ksp divided by 4 to the one-third So that's the same as saying the cube root of, okay? So let's just plug it, plug in. So Well, the only thing we need to plug in is Ksp, right? And we've got that thing up here So remember X up here is molar, so we'll get 6 And that's the way you want to plug it in on your calculator, too Mole, early? Is the molar solubility of lead 2 chloride at, what do we see? Lead, it didn't even give us the Temperature, and whatever temperature that is, okay? Does that make sense? Thank we beat these problems into the ground, right? Okay, you want to kill that one? Is there any questions?