ich of the following protocols may aqueous sodium chloride? O Partition the mixt

Question

ich of the following protocols may aqueous sodium chloride? O Partition the mixture between dichloromethane and water, drain off the bottom layer, and keep the top layer which contains the piperazine O Partition the mixture between hexanes and ethyl acetate, drain off the top layer and keep the bottom layer that contains the pipicazine O Partition the mixture between dichloromethane and ethyl acetate. drain off the top layer, and keep the bottom layer which contains the piperazine O Partition the mixture between ethyl acetate and water drain off the bottom layer, and keep the top layer which contains the piperazine

Explanation / Answer

piperazine --> this is a base

sodium chloride --> salt and aqueous

therefore

we must make "molecular" the base

recall that if this is acidic, then the base will remain protonated

therefore, add a base, so the species become molecualr, i.e. deprotonated

a)

the top layer is not dichlorometahne, but water, therefore will not work

b and c)

ethylacetate > hexane (density)

both are "nonpolar" therefore, the piperazine will distribute on both phases, avoid this mixtures

d)

this is the best procedure, since the ethylacetate will extrac tthe piperzine, the water will remain with very low piperazine

then, the top layer will be ethyl acetate, which is lighter in density, 0.8 vs. 1 g/mL of water

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