 Okay. So let's try this one. This is the quiz question. Calculate the number of equivalents per liter of sulfate ions in a solution that is 2.5 times 10 to the negative 30 molar of sulfate. So all you've got to do, so the molarity of sulfate is times 10 to the negative 30 molar. So to find out, so that is also 2.5 times 10 to the negative 30 moles per liter. So to find the equivalents per liter, you want to take 2.5 times 10 to the negative 30 moles and multiply that by, well, what's the charge on sulfate? It's minus 2. So it's just two equivalents of charge with one mole of sulfate. Because the equivalents is the charge, right? So you just cancel out moles, multiply 2 times 2.5 times 10 to the negative 30, and you're going to get 5.5 times 10 to the negative 30 equivalents, right? The equivalents are per liter. The answer is 5.5 times 10 to the negative 30 equivalents per liter. I think that's, well, clearly it's a homework question as well.