 Let's do this problem here. It says predict the product of the following reaction. So we've got ethanol, which is an alcohol, reacting with formic acid, which is a carboxylic acid. So if it helps you, you can draw this thing out. It actually helps me to do that, or did when I was in your position. So let's draw it out Lewis structure wise. So it's H-C-O-O. So since we're not drawing the mechanism, we're just predicting the structure. All you want to remember is whenever you've got an alcohol and you're reacting it with a carboxylic acid, what you're going to do is from the carboxylic acid you're going to replace this portion, the OH portion here, with this portion here of the alcohol. So everything but that last H. So when we do that, we're going to get something that looks like this. So that's the product we're really interested in. So do you see what I did here? So I took that off, and I put that on. And then there's another product, which is just leftover stuff, OH here. So you make an ester, or that's an ester, those sweet-smelling things, when you react an alcohol, plus a carboxylic acid. Any question on this one?