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Why is it important to have filter paper in a beaker during chromatography

Why is it important to have filter paper in a beaker during chromatography

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Developing a TLC plate requires a developing chamber or vessel. This can be as simple as a wide-mouth jar, but more specialized pieces of glassware to accommodate large plates are available. The chamber should contain enough solvent to just cover the bottom. It should also contain a piece of filter paper, or other absorbent material to saturate the atmosphere with solvent vapors. Finally, it should have a lid or other covering to minimize evaporation.

A wick made from a folded strip of filter paper is used to keep the atmosphere in the beaker saturated with solvent vapor, which is ideal for the development of the plate.

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