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Chromatography

AQA A Level Chemistry

QuestionAnswer
Describe CC. A column is packed with a solid (silica) and a solvent moves down the column
Describe GC. A column is packed with a solid or with a solid coated by a liquid, and an inert gas is passed through the column under pressure at high temperature
Describe TLC. A plate is coated with a solid (silica on a plastic plate) and a solvent moves up the plate
In GC, what is the retention time? The time taken for the substances to be eluted
What are the general names given to the phases in chromatography? Stationary and mobile
What does CC stand for? Column Chromatography
What does GC stand for? Gas Chromatography
What does TLC stand for? Thin Layer Chromatography
What is chromatography? A process to separate the constituents of a mixture (usually coloured dyes at iGCSE) - separation depends on the balance between solubility in the mobile phase and the retention by the stationary phase
What is the Rf value and how is it calculated? Retention factor = (distance moved by the component of a solute)/(distance moved by the solvent)
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