IGCSE Chemistry

Chapter 21.3: Chromatography

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Question

Why do R_f values have no units, and why can an R_f value never be greater than 1?

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Answer

No units: R_f is a ratio of two distances (cm ÷ cm), so the units cancel out.
Never > 1: A dissolved solute can never travel further than the solvent front that carries it.

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