Organic chemistry problems 3. For separating the 9H-fluorene and benzophenone mixture, you used silica gel as yoursolid phase, which has a very hydrophilic/polar surface. Instead of using silica gel, whatwould happen if your solid phase had a hydrophobic/nonpolar surface? Would yourcompounds elute in the same order or not? Could you use the same eluant(s)? Explainyour answers.

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Answered: 3. For separating the 9H-fluorene and…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

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Similar questions

Silica gel (stationary phase) can potentially interact with analytes by what intermolecular forces?
Describe in words and by means of complete chemical equations, how a mixture of 1.25 g of benzoic acid tertbutylbenzene can be separated by applying the separation of 2 components by liquid-liquid extraction.
1. Why is the washing of crystals on the filter paper not as effective a process of purification as crystallization?2. How do you account for the formation of crystals of different sizes in slow and rapid crystallization process?3. What properties should ideally be possessed by a recrystallization solvent?
If the stationary phase used in the given setup is silica, which is more polar? A or B?
What will be the composition of the vapor when a mixture containing 0.30 of A was subjected to fractional distillation with two theoretical plates? a 0.72 A; 0.28 B b 0.87 A; 0.13 B c 0.50 A; 0.50 B d 0.30 A; 0.70 B
In this experiment, you compared the efficacy of simple distillation to the efficacy of a fractionaldistillation for the separation of 2-butanone from toluene. What is the primary difference between theapparatus used in fractional distillation as compared to simple distillation? Based on this information, explain how one might alter the apparatus used in distillation in order to provide a very clean separation between two substances with very similar boiling points. (Repeating the distillation multiple times is NOT a viable option.)
If you are unsure as to which layer in the separatory funnel is aqueous when extracting an aqueous solution with an organic solvent, how could you settle the issue?
Your employer hands you a heterogeneous mixture and asks you to isolate all of thehexane that you can from it. After some analysis, you determine that the mixture contains toluene, hexane,benzoic acid, water, sodium chloride, and sand. Explain how you would isolate pure hexane from thismixture. Remember that you can use techniques such as filtration, extractions, and acid/base chemistrythat we learned earlier in this course in addition to distillation. You may need to look up solubilities and/orboiling points online to solve this problem. You only need to isolate the hexane?
A spot of crude plant extract was placed on a glass plate coated with C18 silica gel. The chromatogram was developed using an appropriate solvent. The result is shown below. Which of the following spot is the most soluble in water?
Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.
Fill in the blanks: a) The component of the mixture that becomes a water soluble salt by treating the two component mixture with sodium hydroxide solution has the highest _______________. b) The lower phase in equipment used for liquid-liquid extraction in a water-dichloromethane mixture is_____________, because _______________. c) The component of the mixture that becomes a water-soluble salt is the one with the greatest ______________
You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know that solvent A has a boiling point of 49 oC while solvent B has a boiling point of 174 oC. Which of the listed method would overall be the most efficient? Fractional distillation Recrystallization Solid-liquid extraction Liquid-liquid extraction Simple distillation Acid-Base extraction

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