Why is it important for you to: keep the beaker containing the mobile phase cove

Question

Why is it important for you to: keep the beaker containing the mobile phase covered while preparing your chromatography paper and developing your chromatograms? remove the chromatography paper from the beaker before the solvent front reaches the top of the paper? In the Example in the Background Information, what experimental evidence confirmed that the unknown mixture contained two FD&C; dyes? Briefly explain. After developing a chromatogram, a student determined that a dye component traveled 3.5 cm and the solvent front traveled 6.2 cm. Calculate the R_f of the dye.

Explanation / Answer

1. covering the beaker would just stop the solvent from evaporating away.

2. removing the paper prevent the solute to separate easily.or else the seperated solute will mix together.

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