Question

Draw an extraction flow chart for the Extraction experiment you completed.

experiment below

Separation of a Benzoic Acid/Biphenyl Mixture by Acid-Base Extraction

Prepare the solution to be extracted by dissolving 2.5 g of a 1:1 mixture of benzoic acid/ biphenyl in 25 mL of tert-butyl methyl ether (MTBE) . Using a 125 mL separatory funnel extract the ether solution with a mixture containing 10 mL of distilled water and 15 mL of saturated NaHCO_{3 .}   Repeat

After removing the aqueous layer, extract the organic layer remaining in the separatory funnel with 25 mL of saturated NaCl solution

Organic Layer Work-up

Dry the organic layer in an appropriate container with anhydrous CaCl₂   for ~ 10 min.(do not stir).

Pour off the liquid ( i.e. decant ) from the CaCl₂ into an Erlenmeyer flask.    Remove the ether by evaporation and weigh the solid residue

Aqueous Layer Work-up

For the aqueous layer, adjust the pH to approximately 3 by slowly adding concentrated HCl dropwise. A white precipitate should form above the solution.

Answer 1