QUESTION IV: (20 marka) An aqueous feed of 200 kgh containing 25wt% acetic acid is being extracted by pure isopropyl ether at the rate of 600 kgh in a multi-stage counter current liquid-liquid extraction system. The exit acid concentration in the aqueous phase is to contain 3.Owt% acetic acid. Determine the following: (a) With a neat diagram, label all the variables and compositions. (1 mark) The compositions and amounts of the exit extract and raffinate streams. (8 marks) (0) The number of theoretical stages required (10 marks) Mass Transfer BCE