 Let's try another partition coefficient question using the same system caffeine in Water in chloroform so we can use all these same numbers. So it says in this question We'll consider aqueous solution of caffeine where we've added 1.5 grams of caffeine but just 1.5 grams of caffeine to 100 mils of water and Then extracted it using one 200 mil portion of chloroform Okay, so now I've got 200 mils of chloroform so Instead of wanting to know the partition coefficient which we know already 9.33 it asks us three questions What quantity of caffeine will be present in the 200 mil chloroform layer after the extraction? What quantity of caffeine will be present in the 100 mil water layer after the extraction and What percentage of the caffeine has been extracted from the original aqueous solution during this extraction? So how will we do this remember? We said that the KP Wanted to be the solubility so that it's going to be chloroform and solvent one Which is going to be water Okay, so solubility is grams per volley will say in Sol solven this is in solvent two, but we do know that we'll just say so we know Kp solvent one 100 Equals this is one point four and then so we know one point four two gram is M2 that's the solvent does the mass in solvent two is 1.42 grams of caffeine will be present in the 200 200 after the extraction 42 and The mass that's going to be left in the water layer is going to be one point four two one point four two So that's going to be left in the water So that's the answer to be What quantity of caffeine will be present in the 100 mil water layer after the extraction? So this is how much is left in the chloroform percentage Of caffeine that's been extracted. So the percentage 1.42 not too long of the video