1- Acetic acid will be extracted from acetic acid-water solution containing 40% acetic acid by mass, in parallel flow extraction unit using partially miscible ethyl acetate. What is the composition of the raffinate at the exit of the 1st stage (R1), given that a mass of solvent equal to the feed is used in each stage? 40% acetic acid, 50% ethyl acetate, 10% water 25% acetic acid, 70% ethyl acetate, 5% water 34% acetic acid, 60% ethyl acetate, 6% water 13% aceticacid, 7% ethyl acetate, 80% water Leave blank