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Anonymous asked in Science & MathematicsChemistry · 3 months ago

The distribution coefficient for iodine between CCl4 and H2O is 85. ?

Calculate the concentration of I2 remaining in the aqueous layer after extraction of 50.0 mL of 1.00 x 10-3 F I2 with the following quantities of CCl4. 


(a) two 25.0 mL portions. 

(b) five 25.0 mL portions. 

1 Answer

  • 3 months ago
    Favourite answer

    There is a real handy equation for doing this calculation:


    where Qaq = the fraction remaining in the aqueous solvent

    Vaq and Vorg are the volumes of the aqueous and organic solvent used in each extraction

    D = distribution coefficient

    n = number of identical extractions

    (a) Qaq = [50/85(25) + 50]^2 = 5.28X10^-4

    So, the remaining concentration in the aqueous layer is (5.28X10^-4 X 1.00X10^-3) = 5.28X10^-7 

    (b) Qaq = [50/85(25) + 50]^5 = 2.03X10^-16

    remaining concentration = 2.03X10^-16 X 1.00X10^-3 = 2.03X10^-19 

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