3, When two immiscible solvents are mixed two layers form. Liquid-liquid extract

Question

3, When two immiscible solvents are mixed two layers form. Liquid-liquid extractions commonly use organic solvents that are less dense than aqueous solutions and, therefore, form the top layer. An exception to this rule is chlorinated solvents which are often more dense than aqueous solution and form the bottom layer. Suppose you were unsure which layer was which during your extraction, how would you determine which layer is the aqueous layer and which is organic? Suppose that just before adding a drying agent to an organic extract from an aqueous solution you notice that there is still a tiny amount of water in the organic layer. What should you do before adding the drying agent? 4.

Explanation / Answer

3. Take about 1-5 mL of fresh water in test tube separatly. than pour few drops of extracted solvent lower layer from separating funnel to the test tube. If drops goes through the water layer and settled at bottom and making separate layer of solvent in the test tube. It means organic layer is heavy than water it will be chlorinated solvents . 4. before using drying agent organic layer can be washed with brine (salt water)

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