A dye has an Rf of 0.42 in a solvent. The solvent front moves 11.5 cm.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
- A dye has an of in a solvent. The solvent front moves . How far does the dye move?
- A second dye on the same paper has an of . How far apart are the two spots?
Need a reminder? The key ideaShow
In chromatography, each dye is carried up the paper at its own speed. , measured from the starting line. It has no unit, lies between and , and identifies a substance in a given solvent.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) .
Step 2. The second dye. .
Step 3. (b) The gap. .
Answer: (a) . (b) apart.
Check. Both spots are below the solvent front at , as they must be.
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