assume all of the ionized aspirin remains in the buffer solution and all of the un-ionized aspirin goes into to the ethyl acetate, what is the molarity of the aspirin in the ethyl acetate at pH 2 and pH 8? what equation would ou use for this?
I believe you are short some information.
You can use the Henderson-Hasselbalch equation (you need pKa for aspirin) and with that (ionized)/(unionized) can be calculated. However, you need something additional to separate one from the other I think.