Suppose triphenylmethanol and biphenyl have R¢ values of 0.30 and0.60, respectively, in a certain TLC experiment. Sketch the final appearance of a TLC plate, roughly to scale, including the starting line and solvent front a. for a pure triphenylmethanol sample b. for a triphenylmethanol sample contaminated with bipheny1

Suppose triphenylmethanol and biphenyl have R¢ values of 0.30 and0.60, respectively, in a certain TLC experiment. Sketch the final appearance of a TLC plate, roughly to scale, including the starting line and solvent front a. for a pure triphenylmethanol sample b. for a triphenylmethanol sample contaminated with bipheny1

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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Why is it important to see the level of solvent in the developing chamber when running a TLC experiment.?
Please answer b.
1. What would be the effect of the following errors in chromatographic work? a. Damaged silica gel was used. b. The chipped end of the TLC plate was used as the starting point. c. The solvent front was diagonal during development.
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The fourth paragraph of your conclusions section should describe how thin layer chromatography could be used to monitor a reaction. Specifically, describe how you could use thin layer chromatography to determine when the reaction “oxidation of methoxybenzaldehyde to methoxybenzylalcohol" has gone to completion. Explain whether the reactant or product would have a larger Rr value, and how you could use that fact with a TLC experiment to know when the reaction is complete. The equation for the reaction is:
Plant pigments in spinach were separated with TLC with cellulose as thestationary phase and 80/20 diethyl ether/acetone mixture as themobile phase. If needed, the solvent structures in the lab Appendix.1. Determine the Rf values of each plant component on this TLC plate.2. Arrange the plant components from most polar to most nonpolar. Please answer both 1 and 2 (picture below is the same question attached )
3. Draw a hypothetical TLC plate that has a ketone standard (with 6 carbons), an alcohol standard (with 6 carbons), and an unknown in separate lanes. The unknown is actually the alcohol but it is impure with the ketone.
In what order( top to bottom) would you expect to find naphthalene, butyric acid, and phenyl acetate on a silica gel TLC plate developed with dichloromethane?
Prelaboratory Questions Name Laboratory Section 1. Read the Introduction and Procedure for this experiment, then answer the following ques- tions about preparing a TLC plate. a) Why must you hold the plate only by its edges? b) Why must you use a pencil and not a pen to draw the starting line that is 14 – ½ inch from the bottom end of the plate? c) Why must the starting pencil line be above the level of the solvent on the chamber? d) Why must the sample spot not be too concentrated? (continued on next pa
See image below
(please answer all questions) 5-30. When marking the sample line on a TLC plate, why is it inadvisable to use a ball-point pen? 5-31. A series of dyes is separated by TLC. The data are given below. Calculate the Rf value for each dye. 5-32. Why is it important not to let the level of the elution solvent in a packed chromatographic column drop below thetop of the solid-phase adsorbent? 5-33. What are some advantages of using column chromatography to purify reaction products in the microscalelaboratory? 5-34. Discuss the similarities and dissimilarities of TLC, paper, and column chromatography. 5-35. Discuss the similarities and dissimilarities of HPLC and gas chromatography. 5-36. (a) What are the main advantages of using flash chromatography?(b) How can TLC be used in connection with flash chromatography? 5-37. Using the information presented on the right, please identify and explainwhich spot has an Rf value of 0.5.
Which one is the more polar component? Explain.