What is the importance of the correct choice of solvent to the chromotographic separation?

this is for paper chromatography..

Answer:
The proper choice of solvent will ensure the best separation possible so the individual components will be separated with no co-elution taking place.
The solvent needs to dissolve the material completely. You also need solvent(s) with the necessary polarity (or dielectric constant) to separate the material you want from the impurities/side products.
Your choice of solvent depends on the polarity of your sample. The sample must be soluble in the solvent but not too much or the sample will just travel with the solvent front. For seperation of different components in the sample, they have to react differently to your solvent, thus traveling at different speeds. This is why most often a mixture of two solvents with very different polarity are used.

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