eli o 75 mi eraeetie acid anil a magnetiu stir bar in so mi dean ut er eye rlenm
ID: 491252 • Letter: E
Question
eli o 75 mi eraeetie acid anil a magnetiu stir bar in so mi dean ut er eye rlenmeyer nask and stir the reacti in Place the 1 rten eyer flask in a water ba ulasso on the magnetic Mirrer ning pH of Nture a 4 th Add inl of 525 a NaOC nalution over a period of 20 minutes, e reaction mi eure below 7 Check the p quently using a paper. After hypo addition is complete continue stirring the mixture for additional 20 minutes at 40 At the end or 20 minutes, check the reaction mixture for excess hypochlorite using star iodide paper stop the stirring and remove few drops of aqueous layer using a Pasteur pipctte and place it on the starch iodide paper A black color indicates presence of excess hypochlorite It this test is negative then add additional amount of NaOCI and continue to stir the reaction misture Tor additional 5-10 minutes 5. If the test is positive then add 0.5ml. of saturated sodium bisulfite on to reaction mixture. This wili neutralize excess hypochlorite present in the reaction mixture. Test the aqueous layer again with starch-iodide paper after 5 minutes o. Continue addition of saturated sodium bisu e 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 5.0 mL of dichloromethane. Separate the organic layer and extract the aqueous layer with additional 50 mL dichloromethane Place the combined organic layer in the separatory funnel and extract with 2.0 mL saturated sodium bicarbonate solution. Separate the organic layer and discard the aqueous layer. 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 mi Erlenmeyer flask Dry the organic layer using sodium sulfate.Explanation / Answer
The organic layer is extracted with saturated sodium carbonate to neutralize the hydrochloric acid which is produced during the reaction.
The organic layer is dried over anhydrous sodium sulfate to remove traces of water present in dichloromethane.
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