10:06( nour Screen Shot 2021-09-21 at 10.0..Sort the following molecules in order of increasing Rf value assuming a normal-phase silica TLC plate was used with a 10:1hexanes: ethyl acetate solvent system.NH2HN1234

In thin layer chromatography is a technique to separate different components in a mixture based on…

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EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter10: Tlc Analysis Of Analgesic Drugs

Section: Chapter Questions

Problem 2Q

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Similar questions

In order to achieve the best separation of several components of different polarity in a mixture spotted on a TLC plate, what guideline should one follow regarding the choice of a developing solvent? (i.e. polar, non-polar, etc,)
An ideal RF value for a compound on a developed TLC plate is 0.30. How could you adjust the TLC developing conditions to obtain an RF of 0.30 if it's too low or too high (Hint: Think about chromatography phases).
A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the un-known material a pure compound? What can be done to verify the purity of the sample?
A mixture of biphenyl, benzyl alcohol, and benzoic acid is spotted on a silica gel TLC plate and developed using Ethyl Acetate with 0.5% acetic acid as the solvent. Predict the relative Rf (highest to lowest).
1. Define sparging. What is the significance of this step in an HPLC analysis? 2. What are the two types of pre-column? What is the purpose of each type? 3. What are the two types of packing used in HPLC column? Describe each type. Please answer numbers 1-3. Need asap
Will a HPLC-UV method be more advantageous than a UV/Vis spectroscopic method for cefuroxime? Explain your answer.
Why are some of the detectors listed unsuitable for HPLC?
When the use of 2D Thin layer Chromatography is better than normal TLC? Please shortly answer at your own words. Answer should be to the point (specific 4-5 lines).
in what order (from lowest to highest Rf) would you expect to find compund A, B, and C on a silica gel TLC plate with dichloromethane? Draw flowchart for separation with org solvent: ether, methylene chloride, aq: HCl, NaOH, NaHCO3
Compare gradient and isocratic mode in HPLC.
(i) Calculate the capacity factors (k') for both compounds A and B and the selectivity factor (a) between them, commenting on the values. (ii) Calculate the resolution between A and B and comment on it. (iii) Using the peak for A, calculate the number of theoretical plates for the GC column and comment on the quality of the column.
A student spots an unknown sample on a TLC plate and develops it in dichloromethane solvent. Only one spot, for which the Rf value is 0.95, is observed. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?

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Sort the following molecules in order of increasing Rf value assuming a normal-phase silica TLC plate was used with a 10:1 hexanes: ethyl acetate solvent system. ÇI NH2 HN 1 2 3 4