Solvent Extraction question at different pH levels

In summary, the dominant forms of the compounds are CH3CH2COOH, CH3CH2NH2, CH3CH2CH2OH, and H2NCH2CH2COOH and their extraction into hexane at pH 12 would depend on their charge, with only neutral species being able to extract. At pH 2, the specie would be protonated and therefore not expected to extract into hexane.
  • #1
H98_
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The question I have been given:
Draw the dominant forms of each of the compounds below and state which, if any, would be expected to extract from aqueous solution into hexane at (a) pH 12 and (b) pH 2. CH3CH2COOH CH3CH2NH2 CH3CH2CH2OH H2NCH2CH2COOH
From my understanding, I can tell what the dominant form is by comparing the pKa of each compound to the pH; if the pH is lower, the specie is protonated. If it is higher, the specie is deprotonated. I am confused on how to tell whether it will extract into hexane? Is it based on whether the specie is charged or not (a neutral specie is the only one that will extract into hexane)?
 
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  • #2
H98_ said:
Is it based on whether the specie is charged or not (a neutral specie is the only one that will extract into hexane)?

Yes.
 
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1. What is solvent extraction at different pH levels?

Solvent extraction is a common technique used in chemistry to separate or purify compounds from a mixture. It involves using a solvent to extract the desired compound based on its solubility in the solvent. The pH level of the solution can affect the solubility of a compound, making it an important factor to consider in solvent extraction.

2. How does pH level affect solvent extraction?

The solubility of a compound is dependent on its pH level. For example, a compound may be more soluble in an acidic solution compared to a basic solution. This means that adjusting the pH level of the solution can help to selectively extract a specific compound from a mixture.

3. What are the advantages of performing solvent extraction at different pH levels?

By adjusting the pH level, it is possible to selectively extract a specific compound from a mixture, making the purification process more efficient. It also allows for the extraction of compounds that may not be soluble at neutral pH levels.

4. What factors should be considered when choosing a solvent for extraction at different pH levels?

When choosing a solvent for extraction at different pH levels, it is important to consider the solubility of the compound, the desired pH range, and the selectivity of the solvent. It is also important to consider the toxicity and cost of the solvent.

5. Can solvent extraction be performed at extreme pH levels?

Yes, solvent extraction can be performed at extreme pH levels. However, it is important to note that extreme pH levels can affect the stability and reactivity of the compounds being extracted. Special precautions and appropriate solvents should be used when performing extraction at extreme pH levels.

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