why was a pencil used to mark the chromatogram and not a ballpoint or ink pen? E

Question

why was a pencil used to mark the chromatogram and not a ballpoint or ink pen? Explain why the cation samples are repeatedly spotted and dried on the chromatog Part B.3. The eluent is to be below the 1.5-cm line on the chromatographic paper. Describe the eluent were above the 1.5-cm line. Explain why the center of the band is used to calculate the R_f value for a cation of the band. 7. suppose two cations have the same R_f value. How might you resolve their presence chromatography? 78 Paper Chromatography

Explanation / Answer

3. Pencil lead is almost 100% graphite and won't be separated by the solvent. Ink, however, is a mixture of dyes and/or pigments and solvents or other liquids. It will be separated by the chromatography solvent.

In fact, oftentimes the chromatographic separation of ink is used as an introductory experiment for the technique.

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