Edexcel A-Level Chemistry A2 15.22 Rf Values From One Way Chromatograms in Paper and Thin Layer Chromatography Tlc and Understand Reasons for Differences Questions

Practise Edexcel IAL Chemistry Rf values in paper chromatography and TLC, using baselines, solvent fronts, spot distances and phase attractions.

Exam points

Calculate Rf from chromatogram distances, avoiding reciprocal or whole-plate measurement errors.
Complete TLC diagrams with a baseline, labelled solvent front and spot position matching the stated Rf value.
Explain low or high Rf values through polarity, solubility and mobile versus stationary phase attractions.

[Maximum number: 1]

This question is about chromatography.

A spot caused by an amino acid has moved 42 mm from the baseline of a paper chromatogram.
The $R_{\mathrm{f}}$ value for the amino acid under these conditions is 0.62 .
What is the distance moved by the solvent?

680 mm

68 mm

42 mm

26 mm

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Edexcel A-Level Chemistry A2 15.22 Rf Values From One Way Chromatograms in Paper and Thin Layer Chromatography Tlc and Understand Reasons for Differences Questions question 1