BRAINCAKEChromatography and Qualitative Analysis
Revision notes for Chromatography and Qualitative Analysis in OCR Chemistry A (H432). 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 separates the components of a mixture so they can be identified.
- Thin-Layer ChromatographyThin-layer chromatography (TLC) is a quick way to find how many components a mixture contains, and to compare them with known substances.
- Rf ValuesThe position of each spot on a TLC plate is described by its Rf value (retention factor): Rf = distance moved by component ÷ distance moved by…
- Gas ChromatographyGas chromatography (GC) separates volatile components of a mixture, and is sensitive enough to detect very small amounts. • The mobile phase is an…
- Retention Times and Peak AreasA gas chromatogram gives two kinds of information.
- Qualitative Tests for AlkenesAlkenes contain a carbon−carbon double bond, C=C.
- Qualitative Tests for HaloalkanesHaloalkanes are identified by hydrolysis with aqueous silver nitrate in ethanol.
- Qualitative Tests for PhenolsPhenols have an −OH group bonded directly to a benzene ring.
- Qualitative Tests for CarbonylsAldehydes and ketones both contain the carbonyl group, C=O.
- Qualitative Tests for Carboxylic AcidsCarboxylic acids are identified by their acidity.