B. How would you purify the compound by extraction with ether. Fill in the missi
ID: 869810 • Letter: B
Question
B. How would you purify the compound by extraction with ether. Fill in the missing information.
Step
Procedure
Purpose
1.
Create a solution of ether and the amine and place the solution into a separatory funnel
Dissolves all material into a non-polar organic solvent, the solvent it is most soluble in when the solute is neutral.
2.
Extracts all polar contaminants into the water layer
3.
Water layer is removed from separatory funnel
4.
Extracts the amine into the aqueous layer
5.
6.
Fresh ether is added to the funnel
To complete the extraction, uncontaminated ether must be added.
7.
Extracts the amine into the ether layer
8.
Water layer and organic layer are drained from the funnel. The ether layer is evaporated
Step
Procedure
Purpose
1.
Create a solution of ether and the amine and place the solution into a separatory funnel
Dissolves all material into a non-polar organic solvent, the solvent it is most soluble in when the solute is neutral.
2.
Extracts all polar contaminants into the water layer
3.
Water layer is removed from separatory funnel
4.
Extracts the amine into the aqueous layer
5.
6.
Fresh ether is added to the funnel
To complete the extraction, uncontaminated ether must be added.
7.
Extracts the amine into the ether layer
8.
Water layer and organic layer are drained from the funnel. The ether layer is evaporated
Explanation / Answer
procedure 2.Add water and Shake the mixture vigourously
purpose 3 To remove all polar contaminants with water
procedure 4 add fresh water to the separatory funnel with amine solution in ether and add a few drops of hydrochloric acid to it,shake.RNH4+ ions may be formed on addition of HCl as ionization of water takes place.RNH4+ dissolves in water while amines dissolves very less..
procedure 5 drain all the ether from the funnel
purpose5 to remove any non -polar impurity that remain dissolved in ether
procedure 7 add a few drops of NaoH to neutralise the acid and then shake vigourously.The non-polar amine becomes more soluble in ether.
purpose 8 To get purified amine from ether.
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