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A pyridine -water solution containing 50% pyridine by weight is extracted in a fuultistage cross current extraction unit. If 250kg of the solution (pyridine water) is extracted in two stages using 200kg of chlorobenzene each time as solvent, calculate the following: (i) What will be concentration of pyridine in the raffinate? (ii) Estimate the percentage extraction of pyridine. Equilibrium data (weight % ) is given below