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numbers 1-3 Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1....


Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1. Why is concentrated su numbers 1-3
perimental Procedure In a 125-mL. Erlenmeyer flask mix 1.5 mL of methyl benzoate and approximately 4.0 mL of concentrated sul
Post-Laboratory Questions-EXP 3 Nitration of Aromatic Compounds Name: Due after completing the lab. 1. Why is concentrated sulfuric acid emploved in thie on? What is the electrophile that is produced by the reaction of sulfuric acid and nitric acid? 2. Why is it important to maintain the reaction temperature low and the addition of nitric acid-sulfuric acid mixture carried out slowly? 3. Explain why concentrated H2SO4, not concentrated HC1, was used in this experiment? 4. Which ring of phenyl benzoate would you expect to undergo nitration more easily? Explain. 5. Which is nitrated faster, toluene or phenol? Explain.
perimental Procedure In a 125-mL. Erlenmeyer flask mix 1.5 mL of methyl benzoate and approximately 4.0 mL of concentrated sulfuric acid (drop-wise), and chill it in an ice bath. Continue to cool the mixture in the ice bath to reduce the heat, which produced in the reaction. After complete addition of sulfuric acid, add approximately 2.0 mL concentrated nitric acid (measured in 10- mL graduated cylinder) drop- wise using a small graduated plastic pipette and mix by gentle swirling. Continue to cool the reaction mixture. Allow the reaction mixture to stand at room temperature for about five minutes. Float the 125-mL flask in a 400-ml beaker hot water bath. Remove the flask occasionally and swirl the content carefully. After fifteen minutes heating pour the reaction mixture in 100-ml of ice water contained in a 150- mL. beaker, with stirring Product Isolation- Isolate the product by vacuum filtration, wash the product with (ice) cold water (20 mL) Note Proper washing removes the more soluble ortho isomer. The crude material may be purified by recrystallization from a small volume (10 mL) of hot methanol (optional). The crude product is pressed dry. You may need to air dry (or hand dry using paper towels) the product. Discard the aqueous filtrate down the drain with lots of water. Determine the weight, melting point, and percentage yield. Pure methyl m-nitrobenzoate melts at 78.5°C. Submit the product to your instructor in a paper wrapped and labeled including your name(s).
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Answer #1

1 dl soy is used for donating sition in this son. 4₂30u - nt & rison Our while n-o-N + 20 - electrophile nitric acid - sulphu

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