Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Question
Chapter 8, Problem 9Q
Interpretation Introduction
Interpretation:
The appearance of the spots on the TLC plate in case of the solvent of low and high polarities should be determined.
Concept introduction:
TLC works on the principle of separation of constituents of a mixture of compounds based on polarity. The polar compounds interact with the stationary phase thus can move to smaller distance from the base. While the non-polar compounds tend to move faster as they interact less with the silica gel, therefore, they move far from the base of the plate.
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What will be the appearance of a TLC plate if a solvent of too low polarity is used for the development? too high polarity?
As solvent polarity increases, the Retention Factor (Rf) of compounds on the TLC plate increases.
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The solvent level in the development chamber should be above the level of the spotted compounds on the TLC plate.
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Chapter 8 Solutions
Macroscale and Microscale Organic Experiments
Ch. 8 - Prob. 1QCh. 8 - Prob. 2QCh. 8 - What problem will ensue if the level of the...Ch. 8 - Prob. 4QCh. 8 - Prob. 5QCh. 8 - Arrange the following in order of increasing Rf...Ch. 8 - What will be the result of applying too much...Ch. 8 - Prob. 8QCh. 8 - Prob. 9QCh. 8 - A TLC plate showed two spots with Rf values of...
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Similar questions
- What will be the result of applying too much compound to a TLC plate?arrow_forwardWhat happens if the spots are made too small when preparing a TLC plate for development?arrow_forwardA) What are the basic principles underlying TLC technique? B) Draw a TLC plate and explain how TLC can be used to identify the presence of a specific compound in an organic mixture.arrow_forward
- how does TLC determine if a sample is pure?arrow_forward1. Which property of compounds is responsible for the separation in a TLC? Explain with an example.2. How does the separation occur during a TLC? (Hints: TLC plate and silica layer)arrow_forwardYou are treating the TLC plate with 5% of sulfuric acid in ethanol. Briefly describe how this works.arrow_forward
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- There were 2 spots on the TLC that did not match up with any of the standards. What were the Rf values of these spots? Identify what these chemical species might be and draw their structures. Solvent was 3:1:1 n-butanol/acetic acid/water. First plate is TLC plate 1. Second plate is TLC plate 2.arrow_forwardThe three TLC plates below show the analysis of the same mixture of two compounds. One plate was developed in 100% DCM, one in 90:10 DCM/MeOH, and one in 80:20 DCM/MeOH. Determine which plate was developed in which solvent.arrow_forwardDuring TLC, what is the stationary phase and what is the mobile phase?arrow_forward
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