Answered: This is an illustration of TLC plates.…

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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Question

This is an illustration of TLC plates. The compounds used were syn-azobenzene (A) and anti-azobenzene (B). The difference between the two plates are that the first was placed in 15% methylene chloride in pet. ether and the second was placed in 30% methylene chloride in pet. ether. I calculated Rf values to be 0.47 mm for syn-azobenzene and 0.44 mm for anti-azobenzene in 15% while syn-azobenze had a Rf of 0.28 mm and 0.16 mm. Which solvent is best at separating and how does Rf help identify which isomer is which? I read that the anti is supposed to have a higher Rf but that is not the case here so I want to know if the syn is supposed to have the higher Rf and the anti is supposed to have the lower one.

J
15% 58mm
27.5mm
25.5%
A B
3
= 27.5mm
Rf (A) 152= 58mm
Rf (B)₁55
Rf
RF (A) 36%
25.5mm
58mm
14 mm
50mm
8 mm
Rf (B) 30%. = 50mm
30% 50MM
14mm
A
"J
8MM
B
= 0.47mm
lib.
= 0.44 mm
= 0.28mm
о. не тот
ķ
a

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