Why is it necessary to extract the aqueous phase repeatedly with Dichloromethane
ID: 864522 • Letter: W
Question
Why is it necessary to extract the aqueous phase repeatedly with Dichloromethane?What organic compounds remain in the product mixture after it has been filtered through the sodium sulfate filter column? Why is it necessary to extract the aqueous phase repeatedly with Dichloromethane?
What organic compounds remain in the product mixture after it has been filtered through the sodium sulfate filter column?
What organic compounds remain in the product mixture after it has been filtered through the sodium sulfate filter column?
Explanation / Answer
a) Dichloromethane CH2Cl2, is a non-polar organic solvent which is not miscible with water (polar solvent). It helps to separate the organic and aqueous phases from a mixture. In addition, CH2Cl2 does not react with the components present in the aqueous layer which is why it is highly suitable for repeated extractions.
b) After the orgainc phase has been extracted from the aqueous layer, there will still be some amount of water retained in the organic layer. When the organic phase is passed over sodium sulphate, the later acts as a drying agent and will absorb the remaining water. Therefore, what will remain are the pure organic components in the product mixture.
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