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GCSE Chemistry · key term
The furthest point reached by the solvent on a chromatogram.
Used by AQA, Edexcel and OCR
Specification 4.8.1.3 · Paper 2
The furthest point reached by the solvent on the stationary phase.
Revise: Chromatography TechniquesRemove the paper before the solvent reaches the top and immediately mark the solvent front in pencil, because the solvent may evaporate. Let the chromatogram dry. Pencil is used for both lines because graphite is insoluble and will not travel with the solvent; pen ink might dissolve and form misleading spots.
Specification 2.9, 2.10 · Paper 1
The furthest point reached by the solvent on the paper.
Revise: Paper ChromatographyRemove the paper before the solvent reaches the top and mark the solvent front while it is still visible. The pattern of separated spots left on the paper is called a chromatogram.
The furthest position reached by the solvent on the chromatography paper.
Specification C2.1g, C2.1i, PAG 3 · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The furthest position reached by the solvent during the experiment.
Revise: Chromatography TechniquesRemove the paper before the solvent reaches the top and immediately mark the solvent front in pencil, because the solvent may soon evaporate. The chromatogram can then be dried.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The furthest point reached by the moving solvent on a chromatogram.
Revise: Interpreting chromatogramsBefore the chromatogram dries, mark the solvent front: the furthest point reached by the solvent. Measure from the baseline to the centre of a spot, then from the same baseline to the solvent front.
Measure both distances from the origin line: to the centre of the substance spot and to the solvent front.
Measure from the baseline to the centre of a spot and from the same baseline to the solvent front.
If an value is greater than 1, check which distances you used: a spot cannot travel farther than the solvent front.
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