27.4-2. Overall Balance in Countercurrent Stage Extraction. An 1339 aqueous feed of 200kg/h containing 25wt% acetic acid is being extracted by pure isopropyl ether at the rate of 600kg/h in a countercurrent multistage system. The exit acid concentration in the aqueous phase is to contain 3.0wt% acetic acid. Calculate the compositions and amounts of the exit extract and raffinate streams. Use equilibrium data from Appendix A.3