 Okay, so this one is number 3 on practice exam 3. What's the pH of the 2.19 times 10 to the negative 3rd molar, the desk of my droxide solution? Well, the first thing you've got to remember is that the desk of my droxide is a strong base. So when you put it into solution, this reaction to occur. OH minus increases your pH. So we need to figure out what is the concentration of the OH minus, not the desk of my droxide. So that's the first thing we want to do. So the concentration of the desk of my droxide is 2.19 times 10 to the negative 3 molar. For every one mole of this, we have one mole of this, one molar. So if we want to figure out, we can do this a couple of ways. So we can figure out the POH for this solution. We want to do that. POH equals negative molar concentration. The pH, well, you've got to remember that... It would be 11.4 or 3.4. 3.4. 3.4? 3.4. Yeah, but this is 2.