Why is the collection done through a 10% Na,CO, solution? Remove traces of acids or neutralizes the excess acid during the dehydration process.
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Q: What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol?
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TOPIC: Preparation of Ethylene
Expound and explain the given answer to the question.
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Solved in 2 steps
- What is the reason for using as little ethanol as possible to dissolve the crude product before recrystalliazation?Why is it required to add drying agent like sodium sulphate to the organic layer which may contain only a neutral compound? ExplainWhat is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol?
- Why is excess ammonia used in the preceding reaction?In addition to a low boiling point and immiscibility with water, why is density important to consider in the selection of an extraction solvent? Would an organic liquid with a density of 1.006 g/mL make a good extraction solvent? Explain.Write the chemical reaction that took place during this experiment.Why is the final product from the crystallization process isolated by vacuum filtration and not by gravity filtration?
- A student recrystallized some impure benzoic acid and isolated it by filtration. He scraped the purified benzoic acid off the filter paper after it had dried and took the melting point as a test for purity. He was surprised that most of the white solid melted sharply between 121 and 122 °C but that a small amount remained unmelted even at temperatures above 200 °C. Explain this behavior.TLC, a powerful analytical tool, can be used to monitor the progress of reactions. The synthesis of ethyl-3-coumarincarboxylate can be monitored by TLC by displaying the starting aldehyde 1, and coumarin product 2, which have very distinct Rf values (Hint: Think about the polarity of compounds 1 and 2 in terms of their abilities to H-bonds to silica gel). What can be determine about the progress of the reaction from analysis of the TLC shown below?1. A student wants to dry a solution of aniline in hexane. Which drying agent should he use for the task? Rationalize the choice. 2. If calcium oxide is used as a drying agent, what is obtained as a product? 3. Why is ill-advised to use P4O10 as drying agents for “wet” acetone?
- How would you recrystallize a mixture of Benzoic acid and 2-Naphthol? Discuss the choice of solvent and recrystallization process. (Hint. Look up the solubility of these two compounds in different solvents)Why is diethyl ether used as a solvent for the reduction reaction of the keystone (3,3-dimethyl-2-butanone) utilizing the reducing agent sodium borohydride (NaBH4). what is the purpose of was repeated washes with water? What is the purpose of repeated washes with brine?After treating the activated carbon with sulfuric acid or any acid, I found out that it is needed to wash it with deionized water or distilled water, why is that so? Please explain in detail.