10. At a temperature of 25 C, a solution of iodine in water contains 5.16*10-5 mg/l of the substance and is in equilibrium with a solution of iodine in CCl4, containing 4.41*10-3 mg/l. How many milliliters of CCl4 must be taken to extract from 100 ml of an aqueous solution in one extraction a) 90%, b) 99.9% of the dissolved iodine. Answer: 10.5 ml, 1170 ml.
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