CH-1392

Chromatography and Rf values

Chemistry · Secondary 4 · Hard · Chromatography and Rf values

A student carries out paper chromatography on a mixture of food dyes using water as the solvent.

One dye has an

R_f

value of 0.80 and another has an

R_f

value of 0.25.

Which statement about these dyes is correct?

The dye with $R_f = 0.80$ is more soluble in water than the dye with $R_f = 0.25$ .
The dye with $R_f = 0.25$ is more soluble in water than the dye with $R_f = 0.80$ .
Both dyes have the same solubility in water.
The dye with $R_f = 0.80$ is less attracted to the solvent than the dye with $R_f = 0.25$ .

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