AQA GCSE Chemistry · 8462
Specification 4.8.1.3 · Paper 2
Revise: Chromatography TechniquesThe solvent is the mobile phase, which moves through the paper.
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GCSE Chemistry · key term
The phase that moves through the stationary phase; in paper chromatography, this is the solvent.
Used by AQA, Edexcel and OCR
Specification 4.8.1.3 · Paper 2
Revise: Chromatography TechniquesThe solvent is the mobile phase, which moves through the paper.
Specification 2.9 · Paper 1
The moving solvent that carries dissolved substances through the paper during chromatography.
Revise: Paper ChromatographyThe mobile phase is the solvent, which moves through the paper and carries dissolved substances with it. The paper contains the stationary phase, which stays in place. Each substance spends some time moving with the solvent and some time held by the stationary phase.
Specification C2.1h, C2.1k · Paper 1 (Foundation), Paper 3 (Higher)
The liquid or gas that travels through or over the stationary phase and can carry components of the mixture.
Revise: Phases in ChromatographyThe stationary phase stays fixed, whereas the mobile phase is a liquid or gas that moves through or over it. The mixture is introduced where the two phases can interact.
The phase that moves through or over the stationary phase, carrying sample components with it.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The liquid or gas that moves through the stationary phase, carrying some components of a mixture with it.
Revise: Chromatography phasesChromatography helps chemists separate the substances in a mixture, such as the different dyes in an ink. It uses two phases: a stationary phase that stays in place and a mobile phase that moves through it. In a simple paper chromatography experiment, the paper acts as the stationary phase and a solvent, such as water, is the mobile phase.
The phase that moves through the stationary phase; in paper chromatography, it is the solvent.
State that the solvent is the mobile phase and that the paper contains the stationary phase; avoid calling the paper itself the stationary phase.
Explain separation by comparing both phases: a component that is more strongly attracted to the stationary phase moves more slowly, while one that is more soluble in or attracted to the mobile phase moves faster.
A substance remaining on the baseline does not necessarily mean chromatography has failed; it may be insoluble in the mobile phase or strongly attracted to the stationary phase.
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