The propanone level in the beaker must be lower than the spot on the chromatography paper. Explain why this is the case.
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Answer: It is important that the solvent level is below the line with the spots on it. ... The reason for covering the container is to make sure that the atmosphere in the beaker is saturated with solvent vapour. Saturating the atmosphere in the beaker with vapour stops the solvent from evaporating as it rises up the paper.
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