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Andy

In paper chromatograhy,why do people always have to cover the container(either with a lid or cover)?

The container contains: Chromatography paper, solvent and dyes (on the chromatography paper itself)?
Abdul Azeez:

To prevent evaporation.
Chromatographic separation relies upon the solvent climbing the paper. If the solvent evaporates while climbing the paper, the separation will be worse.
For separations that take a long time, and for solvents that are volitile, the effect will be worse.

Russ:

Mainly to prevent dust in the air from settling on the paper. That will effect the quality of the picture taken.

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