Solution: Iodine is sparingly soluble in water but much more

Chapter 14, Problem 14.123

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Iodine is sparingly soluble in water but much more so in carbon tetrachloride (CCl4). The equilibrium constant, also called the partition coefficient, for the distribution of I2 between these two phases I2(aq) I2(CCl4) is 83 at 20C. (a) A student adds 0.030 L of CCl4 to 0.200 L of an aqueous solution containing 0.032 g I2. The mixture is shaken and the two phases are then allowed to separate. Calculate the fraction of I2 remaining in the aqueous phase. (b) The student now repeats the extraction of I2 with another 0.030 L of CCl4. Calculate the fraction of the I2 from the original solution that remains in the aqueous phase. (c) Compare the result in (b) with a single extraction using 0.060 L of CCl4. Comment on the difference.