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A TLC plate was run in 1:1 ethyl acetate and hexane, but when developed the plate...

A TLC plate was run in 1:1 ethyl acetate and hexane, but when developed the plate only showed baseline spots. What change could be made to get the spot(s) to move further up the plate?

-Spot a new plate and run again in the same solvent system
-Spot a new plate and run in neat hexane
-Spot a new plate and run in 1:2 ethyl acetate/hexane
-Spot a new plate and run in 2:1 ethyl acetate/hexane
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Answer #1

The answer is: -Spot a new plate and run in 2:1 ethyl acetate/hexane Since spots do not move >more polar solvent needed => hi

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Answer #2

Thin layer chromatography (TLC) is a technic that used to separate non-volatile mixtures. TLC is based the principle of adsorption. The moments of spots on the TLC plate depend polarity of a compound that used. The layer of adsorbent is called as stationary phase When a sample is applied on the TLC plate, a solvent or solvent mixture is moved up the plate through a capillary action. The solvent or solvent mixture is called as mobile phase. When a TLC plate was run in 1:1 ethyl acetate and hexane; the spot, a new plate run in 2:1 ethyl acetate/hexane. Because the plate is stationary phase that is not moved, it requires molar solvent, high ratio of ethyl acetate that is polar in nature. Thus, the correct answer is spot a new plate and run in 2:1 ethyl acetate/hexane.

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