Assume you have an impure sample of biphenyl dissolved i diethyl ether. if the impurity is benzocaine, what aqueous reagant can be used to remove benzocaine from the impure sample by liquid-liquid extraction? Support your answer with relevant chemical reactions.
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Assume you have an impure sample of biphenyl dissolved i diethyl ether. if the impurity is benzocaine, what aqueous reagant can be used to remove benzocaine from the impure sample by liquid-liquid extraction? Support your answer with relevant
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- You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.Your colleague is helping you develop the urine test. They suggest that the urine should be adjusted to a pH above 7 before extracting with the organic solvent. Why is this necessary? Support your explanation with a full arrow-pushing mechanism for the reaction that would occur if the pH was below 7. Include all formal charges, intermediates (if applicable) and products.You are employed as a coop student at the Drug and Alcohol Testing Association of Canada (DATAC) developing analytical tests for sports doping agents. You are asked to prepare a procedure for the extraction of methylphenidate, the active compound in Ritalin, from urine samples (consider them as simple aqueous layers, you do not need to consider other components!). The goal of the procedure is to extract the methylphenidate into an organic layer which will then be evaporated, and the residue will be tested for the drug.You find that methylphenidate is highly soluble in 2-methyltetrahydrofuran, a bio-renewable solvent. Draw the structure of 2-methyltetrahydrofuran and give two reasons why it is a good solvent choice for liquid-liquid extraction.2.1g of sample are dissolved in methylene chloride and the sample is extracted with an aqueous solution of acid and base. Three compounds are isolated - 0.7g of ethyl p-aminobenzoate, 0.6 g of acetanilide, and 0.5 g of benzoic acid. Calculate the % composition of ethyl p-aminobenzoate in the recovered mixture. (Round the answer to 1 significant figure. Give just the number, not a % sign.)
- Restate the paragraph. The main objective of the laboratory activity was to make aspirin also known as acetylsalicylic acid in its scientific name. It was successfully done as aspirin was synthesized using the combination of salicylic acid and acetic anhydride. In this reaction, salicylic acid's hydroxyl group on the benzene ring interacted with acetic anhydride to generate an ester functional group. This is an esterification reaction that produces acetylsalicylic acid. Sulfuric acid was utilized as a catalyst to start the esterification reaction. Some unreacted acetic anhydride and salicylic acid, as well as sulfuric acid, aspirin, and acetic acid, remained in the solution after the reaction was completed. The process of crystallization was used to obtain pure crystals of a substance from an impure mixture. Upon completion of the lab, analysis, and calculations, , it is evident that the synthesis of aspirin is possible using these methods but that the yield will be relatively lowDescribe the difference between protic and aprotic solvents. Provide an example of each to support your answer.You are given a mixture of benzoic acid, 2-naphthol and 1,4-dimethoxybenzene and you are asked to separate the mixture into its following compounds. You are limited to using dichloromethane, pentane, cyclohexane and ethyl acetate as organic solvents. This doesn't involve solvents used to convert the 3 compounds to ionic salts. Suggest possible organic solvents and explain a procedure you would carry out to separate the 3 mixtures briefly.
- Some alcohols undergo rearrangement or other unwanted side reactions when they dehydrate in acid. Alcohols may be dehydrated under mildly basic conditions using phosphorus oxychloride (POCl3) in pyridine. The alcohol reacts with phosphorus oxychloride much like it reacts with tosyl chloride, displacing a chloride ion from phosphorus to give an alkyl dichlorophosphate ester. The dichlorophosphate group is an outstanding leaving group. Pyridine reacts as a base with the dichlorophosphate ester to give an E2 elimination. Propose a mechanism for the dehydration of cyclohexanol by POCl3 in pyridine.You are given a mixture containing the three compounds shown below. Outline a procedure using a flow chart for the separation and isolation of all three compounds, using acid-base extractions. All three are solids at room temperature and are insoluble in deilonized water. You have access to all standard laboratory glassware and equipment, and the standard lab chemicals. .CO2H O,N. „NH2 HO2C napthalene terephthalic acid 3-nitroanilinePropose a method to separate a mixture containing phenol, benzoic acid, naphthalene, and p-nitroaniline. Phenol is soluble in sodium hydroxide solution but insoluble in neutral water or sodium bicarbonate solution. Benzoic acid is soluble in either sodium hydroxide or sodium bicarbonate solutions. Write out the structures of the molecules in your scheme.
- A student dissolved a mixture of benzoic acid (C6H5CO₂H), phenol (C6H5OH) and 1,4 dimethoxybenzene (CH3OC6H4OCH3) in t-butyl methyl ether. She extracted the solution with 5% aqueous sodium bicarbonate, and labeled the extract A. She then extracted the ether solution with 1 M aqueous sodium hydroxide, and labeled that extract B. She added 12 M aqueous HCl to these two extracts, producing a white precipitate in each. The precipitate obtained from solution A is probably... dimethoxybenzene benzoic acid t-butyl methyl ether Ophenol NaClWhat generalization trends may be extracted from the following series in terms of solubility with (a) NaOH, (b) NaHCO3 (c) HCl and (d) H2SO4. Set A Benzoic Acid, Isopropanol, Ethyl acetate, Acetophenone, n-hexane Set B Acetic anhydride, 2S-Butanol, Cyclohexene, Ethylamine, AcetanilideHow do you construct a flow chart using extraction to separate a mixture of the 3 solids used below if dicholoromethane is the solvent and any other reagents can be used. The 3 solids are: pyrazole, p-chlorobenzoic acid, and benzophenone.