Question

Why do different pigments have different rf values?

Answer 1

because they are not equally soluble. . The distance the pigment travels is unique for that pigment in set conditions and is used to identify thepigment. The ratio is the Rf (retention factor) value.


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Answer 2

hy
here is your answer
because pigments vary in their solubility in different solvents, the Rf value for a given pigment is tied to the chromatography solvent.