Essential Chemistry for IGCSE - Particles And Purification (Section 6 - No. 44)
In paper chromatography, what is the purpose of allowing the solvent to run to the top of the paper?
To ensure complete separation of the components
To allow the sample to dry
To prevent the solvent from running off the edge
To measure the R_f value
Explanation
Running the solvent to the top maximizes the separation of components based on their affinity for the mobile and stationary phases.
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