Problems 11 and 12 are based on the following information: A solution contains a valuable material M in water. M is recovered from the soluțion using solvent S. If 9 kg of S is used per kg of solution and the distribution equilibrium is X/Z = 3, where X = kg M/ kg water and Z= kg M/ kg S The % M that will remain in the solution after solvent extraction using 11. Single batch equilibrium stage is b. 35% а. 30% c. 25% d. 40% 12. Two successive batch equilibrium steps using fresh solvent for each step is а. 16.6% b. 17.6% с. 15.6% d. 18.6%

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