Explain why increasing eluent polarity increases the Rf value for a given sample?

Expert Solution

In Thin Layer Chromatography (TLC) there are two phases present, one is the stationary phase (for example silica gel) and the second one is mobile phase this is nothing but the solvents we used for the elution. These solvents are also called as eluents.

Rf value is the measure of the distance traveled by the sample with that of the distance traveled by the solvent front. If a sample travels more distance on the TLC plate during elution, its Rf value will be more.

The distance traveled by a sample depends on the polarity of the solvents in the mobile phase (eluents) you have used during elution. Between ethyl acetate and hexane, ethyl acetate is more polar than hexane. If the polarity of the mobile phase is more, the sample under study will have more interactions with the mobile phase than the stationary silica phase and hence sample travel more distance in the polar mobile phase (eluent) and its Rf value will be more.

queen_honey_blossom answered 2 years ago

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