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Sagot :
Elution sequence for chemicals, from the fastest to the slowest is hydrocarbons, olefins, ethers, halocarbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.
What is Elution sequence ?
No matter how polar the compounds are, the more polar the solvent, the faster the chemicals elute. Therefore, altering the polarity of the solvent will not alter the order in which the compounds elute off a TLC or column. This may seem counterintuitive because a polar solvent would seem to carry polar compounds farther than nonpolar compounds.
Consider that chemicals and solvents will fight for locations on the stationary phase in order to help you visualize this idea. Slow elution will be caused by molecules remaining attached to the stationary phase due to a less polar solvent's poor ability to compete. Molecules and a polar solvent will successfully contend for locations on the stationary phase.
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