Chromatography
- Created by: emilycartwight97
- Created on: 16-09-14 09:46
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Chromatography
- Chromatography is used to separate components in a mixture
- It can be carried out on a small scale for analysis or a bigger scale for purification
- In all types of chromatography, there is a mobile phase (moving: liquid or gas) and a stationary phase (immobile: solid or liquid). The mobile phase flows past the stationary phase, carrying the components of the mixture with it. Interaction with the stationary phase slows components down to a varying extent, allowing separation to occur
Thin Layer Chromatography
- This is a quick and inexpensive analytical method widely used to assess the progress of reactions and the purity of products
- Stationary phase: A thin layer of solid (e.g. silica gel, SiO2) mounted on a piece of metal, plastic or glass
- Mobile phase: an organic solvent (i.e. liquid)
- The solvent disssolves and carries the components of the mixture up the plate. However, they are slowed down and separated by adsorption to the plate
The rate at which a component moves up the TLC plate depends on;
- How strongly the component is adsorbed to the stationary phase. The stronger the adsorption,…
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