Answer to Question #191327 in Organic Chemistry for Mbalenhle

Question

Acid/base extraction

1.Devise a flow chart that outlines the separations performed in experiment acid/base extraction of 2g of benzoic acid,1g of p-nitroaniline and 1g of azobenzene.

2.write down all the chemical reactions that occur in the extraction procedure of benzoic acid,p-nitroaniline and azobenzene.

3.Why is anhydrous sodium sulphate added to the "organic solution"?

4.Why are the "acidic extracts"and the "basic extracts" cooled before neutralization?

5.Why is water used for washing the precipitate on the funnels specified to be "cold"?

Answer 1

1&2

3.In the laboratory, anhydrous sodium sulfate is widely used as an inert drying agent, for removing traces of water from organic solutions. It is more efficient, but slower-acting, than the similar agent magnesium sulfate.

4.Before performing this lab, please review the safety rules that you agreed to follow in the ... Neutralize the combined acidic extracts by adding 10% aqueous sodium. The solution may be kept cool with ice during.

5.The solute is not soluble in the cold solvent, so it safe to use this solvent to transfer the crystals. Wash the crystals with a small quantity of the cold solvent to rinse any impurities off the crystal surface.