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Why is the refluxing time required for the synthesis of methyl salicylate is quite long?
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- Some procedures include the addition of sodium carbonate before liquid-liquid extraction. What is the purpose of this step?Potassium dichromate was used in the chromic acid preparation. Would there be a difference if chromium trioxide was used? Explain your answer.Explain the function of using dichloromethane after the steam extraction of Eugenol. Also discuss if there are any differences and which ones in soxhlet extraction and steam drag.
- Propose an experimental design on the separation of components of the mixture of o-nitrophenol and p-nitrophenol., provide a schematic diagram of the step-by-step procedureChemistry Why was acetanilide not transferred to the aqueous layer in any of the extractions?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?
- After extracting NaOH two times from ether, does the amount of precipitate after adding HCl in both tubes indicate that all acid impurity has been removed from the ether layer containing the neutral compound? There was a lot of precipitate in the first extraction and almost nothing in the second extraction after adding HCl to both.What is the reason behind the portion-by-portion evaporation of DCM in the extraction of eugenol?Briefly explain why should the flask be stoppered after the addition of KI in the standardization of sodium thiosulfate VS.
- Describe the difference between an oil-in-water and a water-in-oil emulsion, and explain the use of the hydrophilic-lipophilic balance system to select an emulsifier.Account for the greater amount of internal pressure in the aspirin extraction versus the ß- naphthol extraction.Why does the sequence for extracting the diethyl ether solution of aspirin acid, naphthalene, and ß-naphthol start with aqueous bicarbonate and follow with aqueous hydroxide rather than the reverse order?Why is methanol chosen as the solvent for recrystallization? What would happen if the student uses dichloromethane instead?