Liquid-Liquid Extraction: Effect on Benzophenone Recovery Rate

  • Thread starter gingerelle
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In summary, the question is asking how the experimental value of benzophenone recovery would be affected if some of the aqueous layer was left behind in the conical tube with the ether solution during the separation process. The answer is that the presence of water in the tube would result in a higher overall mass of the recovered compound, making the recovery rate seem greater even though it is actually lower. Other factors that could affect the recovery rate include the possibility of some benzophenone being mixed into the other layer (aqueous one) that was put into another test tube, as well as impurities that may have been originally present in the mixture being evaporated out with the ether.
  • #1
gingerelle
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Homework Statement


If, in the separation of ether solution from aqueous NaOH layer, som eof the aqueous layer was left behind in the conical tube with the ether solution, how would the experimental value of benzophenone (the compound in the ether solution that is being isolatey) recovery be affected? Explain


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The Attempt at a Solution



So...my guess is that when with water in the tube, after you evapourate all the ether, you're still going to have water with your benzophenone. As a result, the mass of your overall "recovered" compound would be greater than it should be. ...if this was the case, your recovery rate will seem greater, even though it is actually lower.

Is this correct, and are there any other factors that I missed?

As well, another question: what can account for a low recovery percent of benzophenone (neutral component) when the starting mixture contained a carboxylic acid and benzophenone?

perhaps..some of the benzophenone was mixed into the other layer (aqueous one) that was put into another test tube?
uh...

also...impurities that were originally present may have been evapourated out with the ether..?

I don't know if that is possible..please confirm..or reject. thanks..and any other factors?
 
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  • #2
gingerelle said:
So...my guess is that when with water in the tube, after you evapourate all the ether, you're still going to have water with your benzophenone. As a result, the mass of your overall "recovered" compound would be greater than it should be. ...if this was the case, your recovery rate will seem greater, even though it is actually lower.

This part seems OK to me.
 
  • #3
What else is in the water layer?
 

1. What is liquid-liquid extraction?

Liquid-liquid extraction, also known as solvent extraction, is a separation technique that involves transferring a solute (the substance of interest) from one liquid phase to another liquid phase, using a solvent or extractant.

2. What is the purpose of liquid-liquid extraction?

The purpose of liquid-liquid extraction is to separate a desired compound from a mixture by using a solvent that is selective for the desired compound. This technique is commonly used in chemical and pharmaceutical industries for purification and separation processes.

3. How does liquid-liquid extraction work?

Liquid-liquid extraction involves adding a solvent to a mixture containing the desired compound. The solvent selectively dissolves the desired compound and forms a separate liquid layer. The two liquid layers are then separated, and the desired compound can be recovered from the solvent layer.

4. What factors affect the efficiency of liquid-liquid extraction?

The efficiency of liquid-liquid extraction depends on several factors, such as the choice of solvent, the solubility of the desired compound in the solvent, the ratio of solvent to the mixture, and the number of extraction stages. Other factors that can affect efficiency include temperature, pH, and the presence of impurities in the mixture.

5. What are the advantages and disadvantages of liquid-liquid extraction?

The advantages of liquid-liquid extraction include its ability to handle large volumes of material, its relative simplicity, and its ability to selectively extract specific compounds. However, the technique can be time-consuming, and it may require multiple extraction stages to achieve high purity. Additionally, the choice of solvent can be limited, and the process may produce a large amount of waste solvent.

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