Interpreting Chromatograms (AQA A-Level Chemistry): Flashcards

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Interpreting Chromatograms
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Position of less polar components on TLC plate

Travel further up the plate

RfR_f values of less polar components

Higher RfR_f values

Position of more polar components on TLC plate

Stay closer to the baseline

RfR_f values of more polar components

Lower RfR_f values

Solubility of less polar molecules in mobile phase

More soluble in mobile phase

Attraction of polar molecules to stationary phase

More strongly attracted to stationary phase

Formula for RfR_f value in TLC

Rf=component distancesolvent distanceR_f = \frac{\text{component distance}}{\text{solvent distance}}

What lower RfR_f values indicate about polarity

Higher polarity (more attraction to stationary phase)

What higher RfR_f values indicate about polarity

Lower polarity (more affinity for mobile phase)

Typical stationary phase substance in TLC

Silica or alumina (polar substance)

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