Problems and exercisesExtraction
1. One extraction or two
A compound has a partition coefficient K = 4 between ether and water. You have 1.0 g of the compound dissolved in 100 mL of water. How much do you extract with a single extraction with 100 mL of ether? And with two successive extractions with 50 mL?
2. Top or bottom?
In a separatory funnel with water, where is the organic phase if the solvent is: a) diethyl ether (density 0.71 g/mL); b) dichloromethane, CH2Cl2 (density 1.33 g/mL)?
3. Separating three compounds
An ether solution contains benzoic acid, aniline and naphthalene. Suggest how to separate them by acid-base extraction.