Assume an organic compound has a partition coefficient between water and ether e

Question

Assume an organic compound has a partition coefficient between water and ether equal to 7.55. If there are initially 6.18 grams of the compound dissolved in 95.0 mL of water, how many grams will remain in the aqueous layer after extraction with one 30.0 mL portion of ether?

Assume an organic compound has a partition coefficient between water and ether egual to 7.55. If there are initially 6.18 grams of the compound dissolved in 95.0 mL of water, how many grams will remain in the aqueous layer after extraction with one 30.0 mL portion of ether? Number

Explanation / Answer

Given that partition coefficient k = 7.55

k = 7.55 = x g in 30 mL / 6.18 -x g in 95 mL

7.55 = [x / 30]/ [(6.18-x) /(95)]

7.55 = [x .95]/[(6.18-x) .(30)]

7.55 (6.18-x) (30) = 95x

     6.18-x = 0.42 x

     6.18 = 1.42x

     x = 4.35 g

Therefore,

Remaining compound in aqueous layer = 6.18 g - 4.35 g = 1.83 g

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