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A TLC is run using 2:1 hexane/ethyl acetate on an alumina plate. There were three spots...

A TLC is run using 2:1 hexane/ethyl acetate on an alumina plate. There were three spots all close to the bottom of the plate with low Rf values. How could the TLC be changed to increase the Rf's of the three spots to get better separation?

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Answer #1

Different compound in the sample mixture travel at different rate due to difference in their attraction to the stationary phase. If you take silica as a statiomsta phase then since silica is polar it will bind steongly with polar compound while non polar compound bind less and trabet more higher uper in plate.

Regarding your problem please increase the polarity of mobile phase means you have to increase the amount of ethylacetate so that polarity increase and 3 distinct spot seperate easily.

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