Add a trace of acidic acid to the eluting solvent mixture.
TLC is the acronym for thin layer chromatography. This type of chromatography occurs when we have an eluting solvent and a stationary phase such as a thick adsorbent paper on a support.
In a chromatography, there is a stationary phase and a mobile phase. The stationary phase here is the sold support while the mobile phase is the eluting solvent which carried the mixture to be separated.
This stationary phase is spotted with the mixture to be eluted and the chromatogram is observed on the stationary phase. We know that an acid would be eluted by a polar solvent.
If the chromatogram is a stretched circle that appears rounder as you move a little farther then you have to add a trace of acidic acid to the eluting solvent mixture.
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Missing parts;
You are running a reaction to make a carboxylic acid, but what appears to be the product spot is too low on the tlc plate and is elongated, i.e., it isn't a nice circle but is stretched out a lot. To make this spot rounder and move a little farther, which of the following is most likely to work?
Using a more polar eluting solvent mixture.
Adding a trace of ammonium hydroxide to the eluting solvent mixture.
Adding a trace of water to the eluting solvent mixture.
Adding a trace of methanol to the eluting solvent mixture.
Adding a trace of acidic acid to the eluting solvent mixture.
