4. In the experiment TLC: (a) When the best separations are achieved, what values range do R, fall between? (3 points) (b) A student analyzed a sample by TLC and developed it with a mixture solvent, 20% methanol in CH2Cl2. The developed TLC plate is shown below. Please improve the separation condition and explain. You don't need to calculate. (5 points) OCH На OCH

4. In the experiment TLC: (a) When the best separations are achieved, what values range do R, fall between? (3 points) (b) A student analyzed a sample by TLC and developed it with a mixture solvent, 20% methanol in CH2Cl2. The developed TLC plate is shown below. Please improve the separation condition and explain. You don't need to calculate. (5 points) OCH На OCH

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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tras 12. A standard stock solution is diluted to generate three working standard solutions containing ethyl acetate (EA) at 50 ppm, 400 ppm, and 800 ppm. An internal standard, n-butanol (nB), is added so its concentration is 1500 ppm in each of the working standard solutions. The solutions are analyzed using GC- FID. The peak area data for the peak corresponding to ethyl acetate from the standard chromatograms 50 ppm (EA area = 5.05, nB area = 124.37) 400 ppm (EA area = 47.98, nB area = 125.31) 800 ppm (EA area = 98.21, nB area = 98.21, nB area = 130.63) The results for the linear regression analysis for the data set using Excel are: m = 0.7065, b = 0.002134 m = 1.4251, b = -0.003901 m = 1.4215, b = -0.003091 m = 0.7015, b = 0.002231
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5. A mixture was analyzed using TLC and it was doubted to contain three components: R, T, and Y. A non polar solvent was used with a polar stationary phase. Answer the following questions: cm 9. solvent front origin line R T Yrple Y mpte before lofter Which of the doubted components (R, T or Y) are present in the sample? Are there other components in the sample? What are the Rr values ofR and T?
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