What are Rf values?

Answer

In chromatography, the Rf value represents the ratio between the migration distance of a substance and the migration distance of the solvent front. Rf is a coefficient called retention factor and has values that range between zero and 1.

Rf quantifies the distance that each compound of the analyzed mixture has traveled. The higher the Rf value, the longer the distance that a specific compound has traveled. The solvent front always moves further than any of the compound in the mixture. However, the compounds migrate differently depending on the type of mobile phase used because the migration speed depends on some characteristics of the solvent, such as polarity. The Rf value is characteristic for any chemical compound.

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First you should know that RF stands for Retardation Factor, which means migration distance of substance / migration distance of solvent front. You can find more ...
Retention Value (RF) is calculated using paper chromatography. It is calculated by getting ratio of the distance traveled by the solute to that of the solvent. ...
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