Explain how you would separate a mixture of 4-phenylbenzoic acid, 4-phenylphenol and biphenyl using active extraction. Assume 1g of each compound is present in a given solution with ether as solvent. (Hint: use pages 24-25 (slide pages 27-28) in the laboratory manual to help you. If a component is missing, you can ignore that section.)
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- Q1: Give one lysis buffer that is commonly used for western blotting experiments and include its components Q3: To make sure that you used a similar amount of samples, what important step should be done before proceeding the electrophoresis stage? Q4. Why is it necessary to store the prepared lysates in a very low temperature?1.Device a flow chart that outlines the separations performed in acid-base extraction. Acid- benzoic acid Base- p-nitroaniline Neutral compound - azobenzene 2. Write all chemical reactions that occur in the extraction procedure.1. Why was extraction by both acid AND base necessary to arrive at highly purified benzoic acid?
- A Grignard reaction of phenylmagnesium bromide with 3-pentanone gives 3-phenylpentan-3-ol as the major product. The crude product contains the 3-phenylpentan-3-ol product, unreacted 3-pentanone, and biphenyl (a side product). A developing solvent is found that separates the mixture into three spots on a silica gel TLC plate. Considering the functional groups present, predict which compounds would have the smallest and largest Rf values. Briefly justify your answer.Why should we extract the Cyclohexanone in a three step extraction (with 10 ml, 8 ml and 7 ml Ether) rather than in one step (with 25 ml Ether)?For extraction with ethyl-4-aminobenzoate and naphthalene using dichloromethane as the solvent, how does one separate the two compounds from one another?
- a) From this flow chart, which acid is extracted when sodium bicarbonate is used as an extraction solvent? Explain, use knowledge of pKa, why this acid is extracted as opposed to the other acid present. b) What would be the end results if you first extract with NaOH, and then with NaHCO3? c) What would be the results after the addition of HCl to the NaOH extract and the NaHCO3 extracts?In this lab you used acid/base extraction to remove acidic impurities, how could basic impurities be removed through extraction? Imagine the two compounds below are both dissolved in ethyl acetate (a standard organic solvent for extractions), create a diagram/flow chart that outlines steps that could be taken to separate them through acid/base extraction and recover each compound in its neutral Be sure to track when each compound is in the organic or aqueous layer.What impurity was likely removed during the recrystallization necessary and was it effective and why do you think so using the prcedure belwo and the reaction provided. PROCEDURE Synthesis of Dibenzalacetone (A) In this lab you will need to determine the amounts of the reactants you will use. We will use 0.0125 moles of acetone. You need to: (1) convert this into a volume in mL, (2) Calculate the number of moles of benzaldehyde needed based on the balanced chemical reaction, (3) Convert the number of moles of benzaldehyde into volume in mL. Your reagent table should reflect your calculated values. Mix the benzaldehyde and acetone based on the volumes from your prelab calculations in a testtube. Add 25 mL of 10% NaOH solution to a 125 mL Erlenmeyer flask along with a stir bar and 20 mL of ethanol. Make sure the temperature of the solution in the flask is below 25 C before proceeding. Add half of the solution from your test tube to the flask. Allow the solution to…
- How can we check that there is no more vanillin left in the organic layer after it has been extracted from a mixed solution of NaOH?Using the table on slide 7, what ORGANIC solvent could you use to do an extraction of something fromisooctane? What about from acetic acid? b. On slide 7, it says the solvents in grey would not work to extract an aqueous layer. Why not? 6. a. So if you were trying to extract 15mL of an aqueous layer, why wouldn’t you want to use 45mL of theorganic solvent? Why would 20mL be better? b. Why wouldn’t you use 2mL of the organic solvent?Melting point range Recrystallized Phenacetin 95-100 Recrystallized Phenacetin + Reference Phenacetin 110-115 Recrystallized Benzil 92-95 Recrystallized Benzil + Reference Benzil 94-98 Questions: 1. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of mixed melting point. 2. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of melting point. 3. What are two characteristics of a good recrystallization solvent for a given compound? 4. Given a solid sample that contains impurities, how would you determine which solvent to use for a recrystallization? Describe how you would do this in the laboratory. 5. Clearly explain the difference between a recrystallization and a precipitation.