1) What is the reason for extracting the organic layer with 10 ml of water? 2) i
ID: 917907 • Letter: 1
Question
1) What is the reason for extracting the organic layer with 10 ml of water?
2) if during the extraction you observed a cloudy or milky solution what can you do to prevent this from happening? what is this phenomenon called?
3) what is the purpose of making the solution basic i.e adding 10% naoh?
4) what would happen if you added 5% naoh instead of 10%?
there are 4 questions please answer them with as much detail as possible.
You are extracting an unknown base (RNH2), unknown neutral (RH) and unknown acid (RCOOH). In these steps you are extracting each with 2 portions of 25 mL 5% HCL and 1 portion of 10 mL h2o. In the second question is referring to the extraction step i just stated. The third question you are alkalizing the base to a pH greater than 12 with 10% NaOH. The 4th question is asking if you alkalized it with 5% NaOH instead of 10%. Hope it helps.
Explanation / Answer
If water is added to the alcoholic solvents it will form a cloudy or milky solution because of the hydrogen bonding present in between water and alcoholic solvents and misibility.Inorder prevent this formation alcohol solvent should be evoparated and extracted with solvents which are immisible in water like DCM, Ethyl acetate..etc.
If the organic compound contains amines, they shoulld be extracted in the basic medium,hence the solution made basic by adding 10% NaOH solution.If pH value of the solution maintained around 10-12, there will be not much diffrence in using 5% or 10% NaOH solution.
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