Friday, January 8, 2010

Why must the spot applied to a Thin Layer Chromatography plate be above the level of the developing solvent?

Please help asap!Why must the spot applied to a Thin Layer Chromatography plate be above the level of the developing solvent?
Because in that case, the solvent front will creep upward from the solvent level and carry the components of the spot at varying rates to the top.





If the spot is below the solvent level, then the solvent will wash away the spot into the solvent and there will be no development.

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