This video unpacks paper chromatography from start to finish — the underlying principle, the required practical technique, and how to calculate and use Rf values to identify substances. By the end you'll understand not just how to carry out the experiment, but why each step matters and how to interpret a chromatogram as evidence.

What You Will Learn

01:20What the stationary phase and mobile phase are and how they together drive chromatographic separation.

01:44What the solvent front is and why it must be marked immediately after the experiment.

04:16How to calculate an Rf (retention factor) value and what the result tells you about a substance.

05:04Why different substances travel different distances and how solubility and adsorption both play a role.

08:27How to use Rf values to identify an unknown substance by comparison with known reference samples.

15:20How chromatography paper differs from TLC plates and what advantages each offers.

15:54How to describe the required practical technique for paper chromatography in an exam answer.

16:07How chromatography is used analytically to check the purity of a substance or identify components of a mixture.