what is up everyone today we're talking about the acid hydrolysis of Esters or translating into English at least partially we're splitting an Esther apart into two when you see the word hydrolysis two very important halfs of that word Hydro refers to water so we're going to be using water here lysis refers to splitting so we're going to be splitting something with water so whenever you see hydrolysis realize that we're going to split it apart and it's acid catalyzed so that means you're going to see those little H+ up top so notice we'll start with an Esther and we'll add water and that's going to split it apart this is actually exactly the reverse process of esterification we're just taking the Esther back apart okay so let's look at a formal definition and then work some practice problems the acid hydrolysis of an Esther is the splitting of anther into an alcohol and a carboxilic acid by the addition of water and it's completed in the presence of an acid Catalyst okay so here's our Esther and here's our water we're going to get back out our carbic acid and our alcohol so those are the two halves that go into making an ester and we can just take them back apart so what I'm going to do basically is think about splitting the eser in half basically the same exact halfes that I would if I was going to name it and we're going to get out one half with a o tacked onto it and one half with an H remember that water is ohh it has an o and an h and basically the O is going to go hang out right here and the H is going to go hang out on this oxygen so let's draw that product and then we'll look at some step-by-step rules so we'll have h3c and then we go down to a carbon up to a carbon and we have a double bonded to an oxygen and now we're going to go ahead and Tack on our o I'm going to put that in Orange to highlight that that came from the water okay so that's 1/2 of the Esther that we get out and then the other half is that alcohol so I'm going to put the O connected to a carbon and then to a ch3 that's pretty crappy let's write that again I'm going to write it a little up to give us some more room o going up to a carbon and then down to ch3 and then again we're going to put a h here that came from water so notice we just split apart our Esther into a carboxilic acid and an alcohol all right let's do a few practice problems and give you some steps this says complete the acid hydrolysis of the following eser step one draw a line through the co single Bond okay so that's that special magical bond that connects the carboxilic acid half to the alcohol half and now we're going to rewrite the C side and add an O to generate our carboxilic acid Okay cool so we go up to our c o Bond and down and we're going to add an O Okay so that's 1/2 now when I say add an O what I mean is you're going to start by just getting to this point where you have the c o Bond and now we're going to go down and add an o that came from the water and now we're going to write our alcohol half we'll start with the oxygen and go up down up and we're just going to attack a hydrogen on so this H2O became this o and H and that's exactly how we split an eser eser in half with acid hydrolysis of an Esther let's do one more practice problem okay here once again I've drawn my Esther upside down but nothing really changes I've also given a substituent that just comes along for the ride we draw a line through that special Co single Bond okay we're going to start with our carboxilic acid half so we have two carbons meeting like that and going down and double bonded to our oxygen okay then we get to that green line that's where we're going to add o to make our carboxilic acid now it might bother you that that carboxilic acid is upside down and if you wanted to just start by redrawing this molecule and flipping it over that would be totally fine all right now we'll draw our alcohol side we're going to draw the chlorine going up to a carbon down to a carbon and up to an oxygen and now we just add a hydrogen on it to make that alcohol okay so that's how we can basically undo our esterification splitting apart that Esther into a carboxilic acid and an alcohol