WHAT IS Rf VALUE (RETENTION FACTOR)
The movement of any substance relative to the solvent front in a given chromatographic system is constant characteristic of that substance. In paper chromatography Rf value is constant,
Rf = Distance of spot of component from the original line
Distance of solvent front from the original line
In some cases the solvent front runs off the end of the paper and it is more convenient to express the movement of any substance by comparing it with the movement of another substance.
Rx = Distance covered by the component
Distance covered by the standard solvent
The Rx value is useful tool because it is constant when all conditions are exactly reported. Therefore, We can say that Rx values can be used for the identification of substances in most cases.
Chemistry Toics,Chemistry Definitions, Chemistry Notes,Chemistry Reason Questions; Applied Chemistry Notes, Topics, Questions ;F.Sc Chemistry Notes, Topics, Questions; B.Sc Chemistry Notes, Topics, Questions ; M.Sc Chemistry Notes, Topics, Questions ; B.Sc Applied Chemistry ; M.Sc Applied Chemistry