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GCSE Combined Science · key term
Chromatography using a thin layer of silica or alumina on a supporting plate as the stationary phase, with a liquid solvent as the mobile phase.
Used by OCR
Specification C2.1k · Chemistry Paper 1
Revise: Chromatography for Purity TestingPaper chromatography, thin-layer chromatography and gas chromatography can all help distinguish pure substances from mixtures.
When suggesting a method, link it to the sample: soluble dyes suit paper chromatography or TLC; gases and liquids that can be vaporised suit gas chromatography.
In paper chromatography and TLC, keep the sample spots above the solvent level and draw the baseline in pencil.
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