4. A student is performing a liquid-liquid extraction in the lab but does not know the identity of the organicsolvent being used. As such, the student does not know whether the organic or aqueous layer is on thetop or bottom of the separatory funnel. Outline a simple and quick test (not using spectroscopy) that canbe performed in the lab to determine which layers are the organic and aqueous phases.

Step 1: Liquid liquid extraction is one of the types of solvent extraction methods where non-polar…

Answered: 4. A student is performing a…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Similar questions

Measure the benzene and water in the unknown solution mixture using Ultraviolet–visible spectroscopy (Uv).
In the experiment of extraction, what is the organic layer? and in a separatory funnel, will this organic layer be on top or below the aqueous layer? (Kindly view the attached methodology to know the materials being used and to know what's happening).
2. During heating, some solution of NaCl spattered out of the evaporating dish. How would this affect the percent recovery of the mixture?
What physical property determines which solvent sinks to the bottom when performing a liquid-liquid extraction? A. Refractive Index B. Solubility C. Density D. Boiling Point
In this lab, you used rotary evaporation to remove the neutral organic solvent. Rotary evaporation is an example of a distillation except under conditions of a reduced pressure atmosphere. What effect does a reduction in atmospheric pressure have on the observed boiling point? Explain your answer.
purification of egg yolk vitelline 1) Measure the volumes of 3 egg yolks and mix by adding an equal volume of NaCl solution. 2) Extract the mixture with 3 solid volumes of ether and separate the aqueous phase. 3) Do the same procedure 3 times. 4) Mix the sample with water and rinse. 5) It is expected for the protein to collapse. 6) Some more water is added in order to check whether the collapse has occurred completely. 7) The sample is centrifuged and the precipitate is dried.For each step, explain why that action was taken. for example why is NaCl added? Why is the procedure repeated 3 times?
What are emulsions? Why do they form during extractions? How is the formation of an emulsion minimized?
Briefly explain how you determined when the reaction was complete PROCEDURETo a six inch test tube was added thiamine hydrochloride (0.65 g), followed by water (2mL). The mixture was gently shaken until homogeneous, and then ethanol (7.5 mL)was added. Finally, sodium hydroxide (10%, 1.5 mL) was added and the mixture wasgently stirred to ensure complete mixing.Benzaldehyde (3.8 mL) was then added at room temperature in one portion with gentlestirring. The pH of the resulting reaction mixture was determined and adjusted to >10by dropwise addition of 10% sodium hydroxide. The reaction mixture was then partiallysubmerged in a 65 °C water bath2 and the progress of the reaction was periodicallymonitored by TLC analysis.Once TLC analysis indicated that the reaction was complete, the reaction mixture wascooled to approximately room temperature, and then chilled in an ice-water bath. Theresulting precipitate was collected by vacuum filtration and air-dried. The crude productwas purified by…
Here is the procedure: Charge a 35 mL microwave reaction vessel with 12 mL of your vegetable oil and 3 mL of methanol (methanol to vegetable oil approximately at a molar ratio of (6 : 1)). Add 0.12 grams of KOH to the mixture. Heat the solution to 85 °C for 5 minutes with stirring. (Note about microwave accelerated synthesis: The reaction is traditionally performed at 65 °C for 30 minutes under reflux in a vessel open to the atmosphere. Question: Explain the rate acceleration observed in the microwave experiment.
A student is trying to perform a single solvent recrystallization of compound X using methanol. He observed that compound X is insoluble in methanol at room temperature and also insoluble at boiling temperature. Is methanol a good recrystallization solvent? A. Yes, you want to only dissolve the impurities and the sample should remain undissolved. B. No, you need a solvent which fully dissolves the sample only at room temperature so that it can crystallize in the ice bath. C. No, you need a solvent which dissolves the sample only at boiling temperature for selective crystallization upon cooling. D. Yes, you don't want the solvent to fully dissolve the sample at both temperatures so that it will crystallize in the cooling step. A student obtained a supersaturated solution in the recrystallization experiment. Which of the following methods should he/she perform to induce crystal growth? (Can select more than 1) A. Add a crystal of pure acetylsalicylic acid B. Place the solution in an ice…
When conducting a recrystallization what should generally be true when comparing the compounds melting point compared to the boiling point of the solvent? Explain why this is so.

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