IB Chemistry SL 2.2.10 Chromatography Question Bank

Practise IB Chemistry SL 2.2.10 by calculating RF values and linking component movement to relative attractions between the stationary and mobile phases.

Exam points

calculate Rf by dividing a spot's distance by the solvent-front distance from the baseline
link greater movement to the balance of mobile- and stationary-phase attractions
justify a level baseline, solvent below the spots and a sealed chromatography chamber

[Maximum number: 1]

Proteins are made of long chains of amino acids.

A mixture of amino acids was spotted onto chromatography paper and eluted with a solvent mixture. The following spots were seen after the paper had been developed with ninhydrin.

Figure for Question 2.2.10—Chromatography question 1 — IB Chemistry SL

Determine the $R_{\mathrm{f}}$ value of the amino acid marked as X .

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2.2.10—Chromatography question 1