A chemistry student performs a paper chromatography experiment to analyze the components of a green marker ink.
The resulting chromatogram and measurements are shown in the diagram below:
a.[2]
Calculate the Rf R_f\,Rf values for both the yellow and the blue dye spots shown on the chromatogram.
b.[2]
Identify the stationary phase and the mobile phase in this chromatography experiment.
c.[2]
A second student repeats this experiment under identical conditions but uses a different solvent, leading to different Rf R_f\,Rf values for the same dyes. Explain why changing the solvent changes the Rf R_f\,Rf values.