7. A mixture containing 30% acetone and 70% chloroform is extracted with a mixed solvent containing acetic acid and water. The two immiscible phases-the raffinate and extract phases-that result after extraction had the following analysis: Extract: acetone 7.0%, chloroform 3.0%, acetic acid 30.0% and water 60.0% Raffinate: acetone 20.0%, chloroform 67.0% acetic acid 10.0% and water 3.0% For the basis of 100 kg of the mixture extracted, determine the following: (a) The composition of the mixed solvent on a weight basis (b) The quantities of raffinate and extract phases (c) The amount of mixed solvent used