All Questions
Tagged with chromatography polarity
11
questions
2
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43
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TLC experiment interprentation
I am having difficulty interpreting the results of an identification test involving six different standards (dyes) in an unknown mixture of dyes, using silica gel TLC plates and acetone as the mobile ...
- 17
-1
votes
1
answer
922
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Retention Time Change in Reversed Phase Chromatography (revised)
I previously learned in books that in reversed phase chromatography, retention time changes depending on the content in mobile phase, which means as the polarity of mobile phase increases, retention ...
- 35
-1
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1
answer
111
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Compound Polarity Lookup
I know from the literature that the following compounds have decreasing polarity: Rosmarinic Acid -> TMF -> Sinensetin and I guess comparing compounds of ...
- 99
2
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1
answer
1k
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How to determine polarity of components in TLC
Estimate how a TLC-analysis would look like for the following reaction when you take a TLC at: a) the start of the reaction, b) after 65% conversion and c) after full conversion of A. (You may assume ...
- 187
1
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0
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Why is methamphetamine less polar then amphetamine? [closed]
The question is as stated in the title. Is there a general way to determine relative polarity of organic compounds?
This question is for use in the context of the manner in which polarity of the ...
- 119
0
votes
1
answer
503
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Affinity to mobile or stationary phase during column chromatography [closed]
I have carried a column chromatography and obtained two compounds. The first one is liquid (ester) and the second one is solid (nitro) yet I know that the second compound is less polar than the first ...
- 37
3
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1
answer
30k
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How to determine the order of elution in silica gel column chromatography?
Benzofuranoids ustusoranes A (1), B (2), and E (3) were isolated from Aspergillus ustus 094102. If these compounds were separated by column chromatography on silica gel, what would be the elution ...
- 119
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1
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Do polar compounds travel further or less far than unpolar ones in hexane/ethyl acetate TLCs?
Would ethyl acetate/hexane be considered nonpolar or polar overall? I know that the ethyl acetate is polar and the hexane is nonpolar. I am trying to understand what if polar or nonpolar analgesics ...
- 191
7
votes
2
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75k
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If the polarity of the solvent increases, will the Rf value increase or decrease?
True or False: A sample of aspirin has an $R_f$ value of 0.20 when measured on a silica gel TLC plate with a certain solvent mixture. If the polarity of the solvent is increased, the $R_f$ value of ...
- 89
2
votes
1
answer
14k
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Why is phenol more polar than alcohol?
Why is phenol more polar than alcohol. I mean the benzene ring seems to be extremely unpolar. Furthermore, is the hydrogen bonding stronger in phenol than in alcohol? Are polarity and hydrogen bonding ...
- 307
3
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Running behavior of glucose, galactose and mannose in TLC
I have separated the sugars glucose, galactose and mannose by thin-layer-chromatography. My question is why these sugar have different running behaviors and a separation is possible.
Glucose have the ...
- 91