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Why would you add a piece of filter paper to your TLC developing beaker (jar)?

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 13CTQ

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Why would you add a piece of filter paper to your TLC developing beaker (jar)?

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A student performs a TLC experiment and at the end of the experiment, sees no spots other than the initial spot. What does this mean, and what should the student do to fix the problem?
does a co spot on TLC plate have two Rf values?
Why should you not use a ballpoint pen when marking a TLC plate and why does the horizontal line need to stay above the eluent? What problems do you think can occur? Explain your answer.
It is acceptable to draw the TLC spotting line with a pen as long as it is marked very lightly. True False
If a TLC was run in a solvent system that caused all the spots to show up at the baseline, how could the system be adjusted so that Rf values could be determined?
What happens if the spots are made too small when preparing a TLC plate for development?
Both melting points and TLC rely on differences in non covalent forces. Explain the role of these non-covalent interactions in the final answer obtained (melting point and Rf value).
which would stain with KMnO4 after a TLC Please provide only typed answer solution no handwritten solution needed allowed
What is the purpose of thin layer chromography lab? What is a hypothesis I can use when conducting a TLC lab and how can that hypothesis be tested?
You decided to check the purity of your product by TLC. You spotted salicylic acid (lane 1), your crude synthetic aspirin (lane 2) and a sample of pure aspirin (lane 3). After elution, draw a picture of what developed TLC plate (UV visualization) would look like?
Before developing a TLC plate you should _______.a. Make sure to mark the origin with a pen b. Make sure to mark the origin with a pencil c. Make sure the filter is all the way around the inside of the developing chamber
For TLC analysis, another student calculates the following Rf values for her samples: 1.45=aspirin; 1.25=Ibuprofen; 1.35=acetaminophen; 1.15=naproxen; 1.05=caffeine. 1.40=over-the-counter drug (unknown) Are these values reasonable? Why or why not? Explain what the student may have done incorrectly.