Which method would be most appropriate for accomplishing the removale of trace amounts of acetic acid from a sample of ethyl acetate? A. recrystallization B. extraction C. distillation D. evaporation
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- Why was the reaction solution washed with ether after the KOH reflux, ie. what compound(s) dissolves in the ether?What is/are the limiting reagent(s) for this three-step procedure? Why is sodium borohydride not the limiting reagent even though a smaller number of moles of this reagent are used? Mass/volume used in experiment: O-vanillin = 0.760g P-toluidine = 0.535g Ethanol = 15 ml Sodium borohydride = 0.1 g Glacial acetic acid = 2 ml Acetic anhydride = 2 ml5. 1. What is the purpose of testing distilled water and laboratory ethanol in the testing of ethanol? 2. During the experiment, you recorded the vapor temperature of the samples. Does the literature B.P. of ethanol correspond to the recorded temperatures? Why or why not? 3. Based on the iodoform test, did your distillate portion contain ethanol and/or water? Explain?
- 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…During the reaction of 1-bromobutane with sodium ethoxide, a white precipitate form. This precipitate disappears during the initial quench (addn of water) of the work-up procedure. What is it? Where did it go?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?
- 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?A solution of the following three compounds in ether is extracted first with aqueous HCl, secondly with aqueous NaHCO3. Where will each of the three compounds reside after the procedure: the NaHCO3 extract, the HCl extract, or the ether layer? Please explain with the help of pKa numbers. (image of compounds attached)• What if there is no stability in the emulsion? • How does an emulsion work? • How do you prepare an emulsion? • Provide and explain examples of defoamers that you recognize.
- How can the Eugenol content be separated from the alkaline solution?In most distillations, the total volume of liquid obtained (distillate + residue) is possible sources of loss in this procedure?What indication in the "test tube test" (procedural step 9) will be given if Na3PO4 is the limiting reagent? What if BaCl2 is the limiting reagent? Explain why