s nal of neetic acid and a magnetic stir bar in a 50 mt the rlenmeyer mask in a

Question

s nal of neetic acid and a magnetic stir bar in a 50 mt the rlenmeyer mask in a water bath oglass) on the magnetic stirrer and stir the reautit mixture at och solution over a period of 15-20 minutes, pH the reaction mixture below 7. Check the pl frequently using a pH paper After the continue stirring the reaction mixture for additional chlorite addition is complet hypo C. o 23 minutes at the reaction mixture for excess hypochlorite using starch- 20 minutes, check iodide paper. Stop t stirring and remove of aqueous layer Pasteur pipeue and place it on the starch iodide paper. A blue-black color indicates presence of excess If this test then add additional amount of NaOCI and continue to stir the reaction mixture tor additional 5-10 minutes s If the test is positive then add 0.5mL of saturated sodium bisulfite solution to reaction mixture. This will neutralize excess hypochlorite present in the reaction mixture. Test the aqueous laver again with de paper after minutes o. Continue addition of saturated sodium bisulfite in 0.5 mL portions if the test is positive 7. Transfer the reaction mixture to a separatory funnel and extract the organic layer with s mu of dichloromethane. Separate the organic layer and extract the aqueous layer with additonal 5.0 mL dichloromethane. Lwow e 8. Place the combined organic layer in the separatory funnel and extract with 2 ted sodium bicarbonate solution. Separate the organic layer and discard the aqueous layer 9 Place the organic layer back in the separatory funnel and wash it with 5.0 ml, water Transfer the organic layer to a clean and dry 25 mL Erlenmeyer flask. Dry the organic layer using sodium sulfate

Explanation / Answer

In this experiment you have used acid. Sodium bicarbonate has a basic nature. It is added to neutralize any excess acid present .

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