 Okay, so let's determine the solubility from the KSP, so opposite of what we just did. So let's calculate the solubility of calcium hydroxide in water if the KSP is 6.5 times 10 to the negative 6. So how do we do these things? We're going to have to write out the chemical equation numbers, okay? So if you don't know your polyatomic ions, it's going to be very difficult for you guys to do this particular act of problem. You don't know your insoluble, so you don't know your slightly solubility. So KSP of this is going to be CO2 plus OH minus square, remember your squares? So that equals KSP. Well, how do we figure out what those concentrations are? Can anybody venture a guess? Ice table, okay? So if you don't remember how to do an ice table, my goodness, I'm doing them all semester, okay? So solids, throw that, go on to the next, right? So did we start with any calcium? No. Any hydroxide? No. In these particular ice tables, I like to use instead of XS to remind myself I'm doing solubility. So this is going to be plus S, and this one's going to be what? Plus 2X, okay? So this is S, 2X. So we're looking for the solubility, so for S there, okay? So let's just plug in everything into this equation, that's all we have to do. So we've got the KSP value, 6.5 times 10 to the negative 6 equals S to S squared. So it's going to equal 4S squared times S, so that's 4S cubed times 10 to the negative 6. So S cubed equals 6.5 times 10 to the negative 6 divided by 4, and so S equals that to the 1. So that would be S is the solubility, that's what we're looking for, all we have to do, hold it. So that's the solubility for calcium hydroxide. Any questions on that one?