1. The lab manual suggests an alternate strategy for the separation of aspirin from caffeine - that caffeine can be converted into a water-soluble salt by an acid extraction. Draw the structure of the caffeine salt that would form during this extraction. Use a generic acid HA. 2. Why was it important to add calcium chloride to the dichloromethane solution of caffeine? 3. [Refer to JoVE video on solid-liquid extraction] Describe how a Soxhlet extraction works. Why would one perform a Soxhlet extraction instead of standard solid-liquid extraction like the one you performed? What applications of Soxhlet extraction were described in the video? 4. Suppose that you carried out a reaction in aqueous medium and now need to extract your organic product, which probably already started to separate out as it formed, out of the reaction mixture. In which layer, top or bottom, would you expect the product to be if you add ether? What about if you add methylene chloride? Explain your answer.

1. The lab manual suggests an alternate strategy for the separation of aspirin from caffeine - that caffeine can be converted into a water-soluble salt by an acid extraction. Draw the structure of the caffeine salt that would form during this extraction. Use a generic acid HA. 2. Why was it important to add calcium chloride to the dichloromethane solution of caffeine? 3. [Refer to JoVE video on solid-liquid extraction] Describe how a Soxhlet extraction works. Why would one perform a Soxhlet extraction instead of standard solid-liquid extraction like the one you performed? What applications of Soxhlet extraction were described in the video? 4. Suppose that you carried out a reaction in aqueous medium and now need to extract your organic product, which probably already started to separate out as it formed, out of the reaction mixture. In which layer, top or bottom, would you expect the product to be if you add ether? What about if you add methylene chloride? Explain your answer.

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...

See similar textbooks

Similar questions

4. The presence of a stabilizer of sodium benzoate in a medicinal product, a 3% hydrogen peroxide solution, is proved by reactions by formation: A) White precipitate with hydrochloric acid B) Discoloration of potassium permanganate solution B) Yellow staining with a solution of potassium iodide D) Blue staining with a solution of potassium dichromate in a mixture of sulfuric acid and ether E) Solid sediment with iron (III) chloride solution
Questions 1. What precipitate formed when the ester was added to the solution of your Grignard reagent? 2. What advantage(s) does tetrahydrofuran (THF) have over diethyl ether as a solvent in this experiment? 3. What would be the correlation between the color of your dye solution and the wavelength of its maximum absorbance in the visible spectrum of the solution?
Which of the following is FALSE? a. In the extraction of caffeine, caffeine was dissolved in the water and the other impurities were dissolved in the ethyl acetate layer. b. Addition of potassium hydroxide will improve the purity of caffeine in the extraction process. c. Salts could be added to the solution to remove the formation of emulsions in the solution. d. K2CO3 can be used as an alternative to NaOH.
Why is the NaCl extracted with water three times as opposed to only once?
2. What is the major disadvantage and the major advantage of using anhydrous sodium sulfate for drying organic liquids?
How do you obtain napthalene,napthol and benzoic acid from a sample using recrystallization?
answer question 2.
What is magnesium sulfate used for at the end of the extraction? How can it be removed?
If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractions
can you help with number 6.
Write all the chemical equations that occur in this procedure. See image below
The method of extraction for Roman chamomile is: Choose one answer. a. cold-press extraction b. steam distillation c. water distillation d. solvent extraction