Hello, i'm struggling with another extraction problem
The problem states:
"Data for solubility for 1 g of aspirin or salicylic acid:
Aspirin - 300 mL of H20, 17 mL of chloroform, 12 mL of ethyl ether
Salicylic acid - 460 mL of H20, 42 mL of chloroform, 3 mL of ethyl ether.
If you had a mixture of equal weights of aspirin and salicyclic acid, which solvent pair (ether-water) or (chloroform-water) would give the most efficient extraction. Why?"
I orginally thought that the answer was ether-water. I first calculated the partition coefficients for each solvent pair. Then I saw that the ether-water partition coefficients were larger, and so thought that ether-water would give the most efficient extraction.
However, the answer states: "Chloroform-water. Neither will be very good because both aspirin and salicylic acid will largely extract into the organic phases in all cases. However, the chloroform-water system elaves mroe in the aqueous phase and thus allows a better separation. A different means of purifying the compounds is needed."
Could someone help me out/help understand what's going on?