Paper chromatography is a simple method used to separate and identify the components…

CHEMISTRY · Multi-part · A Level · Chemistry · Chromatography · Chromatography

Problem

Paper chromatography is a simple method used to separate and identify the components in a mixture. (1) State the meaning of the term “retardation factor value RfR_f ” for a component spot on a chromatogram. (2) The following data were collected:
CompoundDistance travelled / mm
A32
B75
Solvent96
Calculate the RfR_f value of compound A. (3) Outline how the RfR_f value of a spot can be used to identify a compound. (4) Explain why the RfR_f value for the same component can be very different if different solvents are used for the mobile phase. (5) State one other type of chromatography that can be used to separate the components of a mixture.

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