BRAINCAKEChromatography
Revision notes for Chromatography in AQA Chemistry (7405). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- ChromatographyChromatography is used to separate and identify the components of a mixture.
- Thin-Layer ChromatographyThin-layer chromatography (TLC) is a quick, cheap way to separate a small sample, check its purity or identify its components.
- Rf ValuesIn TLC, each component moves a characteristic distance relative to the solvent.
- Column ChromatographyColumn chromatography (CC) works on the same principle as TLC, but is used to separate and collect larger amounts of the components of a mixture…
- Gas ChromatographyGas chromatography (GC) separates mixtures of volatile substances: liquids or gases that can be vaporised without decomposing.
- Retention TimesIn gas chromatography, the retention time of a substance is the time taken from injection of the sample to that substance reaching the detector.
- Combining Chromatography with Mass SpectrometryGas chromatography separates a mixture very well, but retention times alone cannot always identify a component, because different substances can…