Yahoo Answers is shutting down on 4 May 2021 (Eastern Time) and, as of 20 April 2021 (Eastern Time), the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Anonymous
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.

Update:

(a) two 25.0 mL portions.

(b) five 25.0 mL portions.

### 1 Answer

Relevance
• Favourite answer

There is a real handy equation for doing this calculation:

(Qaq)n=[Vaq/(DVorg+Vaq)]^n

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

Still have questions? Get answers by asking now.