Compound A is an organic molecule with a molecular weight of 152 and its neutral
ID: 815568 • Letter: C
Question
Compound A is an organic molecule with a molecular weight of 152 and its neutral. Compound B is an organic molecule with MW of 150 and is basic. Both are soluble in CH2CL2 to a reasonable extent. A and B are partitioned/extracted with a mixture of CH2Cl2 and aqueous acid. The layers are then separated.
Where is B mostly found after this extraction?
a. in the CH2Cl2 layer
b. in the aqueous layer
Where is A mostly found after this extraction?
a. in the CH2Cl2 layer
b. in the aqueous acid layer
After separation of the Ch2Cl2 layer, the aqueous acid layer is then made basic with aqueous NaOH. However, neither A nor B precipitated out or crystallized. What is the best way to recover the compound which did not precipitate?
a. distill the aqueous layer using fractional distillation and collect the fraction containing the compound which did not precipitate
b. extract the aqueous layer twice with an equal volume of Ch2Cl2 and then evaporate off the Ch2Cl2
c. reacidify the acidic layer and attempt to crystallized it.
Explanation / Answer
Where is B mostly found after this extraction?
a. in the CH2Cl2 layer
Where is A mostly found after this extraction?
b. in the aqueous acid layer
After separation of the Ch2Cl2 layer, the aqueous acid layer is then made basic with aqueous NaOH. However, neither A nor B precipitated out or crystallized. What is the best way to recover the compound which did not precipitate?
a. distill the aqueous layer using fractional distillation and collect the fraction containing the compound which did not precipitate
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