Chromatography (AQA GCSE Chemistry Combined Science): Flashcards

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Chromatography
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What is chromatography?

Method to separate and identify compounds in mixtures

Purpose of Rf value

Identify chemicals in a mixture

Three key components of chromatography

Analyte, stationary phase, mobile phase

The analyte

Mixture of chemicals to be separated

The stationary phase

Solid material that stays still during experiment

The mobile phase

Liquid or gas that moves through stationary phase

Speed of strongly attracted chemicals in chromatography

Move slowly

Speed of weakly attracted chemicals in chromatography

Move quickly

Stationary phase in paper chromatography

Chromatography paper

Mobile phase in paper chromatography

Solvent (e.g. water or alcohol)

Rf value formula

Rf=Distance of chemicalDistance of solventRf = \frac{\text{Distance of chemical}}{\text{Distance of solvent}}

Rf value under same conditions

Always the same

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