Question
Please help me Sketch a separation scheme showing how you would separate the following two component mixture: m-nitroaniline and hexanol. All the substances are soluble in ether. You can use any of the following solutions in your separation: aqueous hydrochloric acid, aqueous sodium bicarbonate, and aqueous sodium hydroxide. Thanks
Answers
Dr Russ
1. dissolve mixture in ether
2. transfer to separating funnel
3. shake mixture with aqueous HCl
4. separate and save aqueous
5. repeat 3-4 twice more
6. wash organic phase with bicarbonate solution
7. separate, discard aqueous and transfer organic phase to a flask [this now contains the hexanol as a solution in ether]
8. pour acid solution from steps 3-5 into a separating funnel.
9. add aqueous NaOH until alkaline (use pH paper)
10. extract with ether and save organic phase
11. repeat 10. twice. [the extract has a solution of the analine in ether]
12. evaporate the ether from the two solutions to recover the two substances.
There is no mention of a drying agent. In both cases you would use a drying agent to remove water traces before evaporating the ether.
I can't draw the scheme on here but these are the major steps.
2. transfer to separating funnel
3. shake mixture with aqueous HCl
4. separate and save aqueous
5. repeat 3-4 twice more
6. wash organic phase with bicarbonate solution
7. separate, discard aqueous and transfer organic phase to a flask [this now contains the hexanol as a solution in ether]
8. pour acid solution from steps 3-5 into a separating funnel.
9. add aqueous NaOH until alkaline (use pH paper)
10. extract with ether and save organic phase
11. repeat 10. twice. [the extract has a solution of the analine in ether]
12. evaporate the ether from the two solutions to recover the two substances.
There is no mention of a drying agent. In both cases you would use a drying agent to remove water traces before evaporating the ether.
I can't draw the scheme on here but these are the major steps.