Question

# Suppose you have discovered a new organic molecule and it is somewhat soluble in water even...

Suppose you have discovered a new organic molecule and it is somewhat soluble in water even though it is more soluble in dichloromethane or ether solvents. If you do a single extraction, you get only 60% of your material to transfer from the water to the organic layer. How many washes would it take to extract over 90% of your organic material from the water layer. Explain.

You need to perform 3 extraction to get 90 % of the organic molecule.

 Extraction No. 1 Extracted = 60 % Left in aqueous layer = 100-60 = 40 % Total Extracted = 60 % Extraction No. 2 Extracted is 60 % of the left in aqueous layer = 40 x 60/100 = 24 % Left in aqueous layer = 40 - 24 = 16 % Total extracted = 60 + 24 = 84 % Extraction No. 3 Extracted is 60 % of the left in aqueous layer = 16 x 60/100 = 9.6 % Left in aqueous layer = 16 - 9.6 = 6.4 % Total extracted = 84 + 9.6 = 93.6 % Extraction No. 4 Extracted is 60 % of the left in aqueous layer = 6.4 x 60/100 = 3.84 % Left in aqueous layer = 6.4 - 3.84 = 2.56 % Total extracted = 93.6 + 2.56 = 96.16 %

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