Question

Other than relative solubilities, what are two additional factors that may be worth taking into consideration...

Other than relative solubilities, what are two additional factors that may be worth taking into consideration when choosing an organic solvent for use in a liquid-liquid extraction against water? Justify your choices.

Homework Answers

Answer #1

1. Partition coefficient of solute between organic solvent and water. If the partition coefficient is larger then the solute can be extracted easily from water by organic solvent.

2.Organic Solvent should be inert towards solute. That means solvent should not react with solute during the extraction. If the solute reacts chemically with the solute then it is impossible to separate the solute from organic layer after extraction.

3. Volume of extraction solvent can also play major role. If we have only 200 mL of organic solvent to extract the solute from water, then it is better to use two or more times than single use. That means if 200 mL at a time we can extract less amont than the amount extracted by using solvent two or more times (100mL + 100mL or 50 ml four times etc)

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