Please also explain why you picked your answer. A volatile substance is usually

Question

Please also explain why you picked your answer.

A volatile substance is usually used to dissolve a sample before spotting onto the TLC plate. Which ONE of the following is the reason why a volatile solvent is usually used? To enable the sample to be separated in order to evaporate across the TLC plate. The TLC plate would usually be in the dry state and requires a solvent to prepare the surface. To avoid excess spreading of the sample across the TLC plate. The TLC plate requires a volatile solvent that would allow the non-volatile sample to be in the correct state for analysis.

Explanation / Answer

Answer: D

explanation

the non-volatile samples are free to move with the volatile solvent if they are not bound to the surface of the silica gel. Thus, the fraction of the time that they is bound to the surface of the silica gel relative to the time it spends in solution determines the retention factor of the non volatile.

So volatile solvents require to use in the analysis of non volatile samples.

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