Thin Layer Chromatography

How do you calculate retention factor?
Distance travelled by sample / Distance travelled by solvent
Distance travelled by solute / Distance travelled by sample
Distance travlelled by sample / Distance travelled by solute
Distance travelled by solvent / Distance travelled by sample
Why is pencil used to draw the base line?
It is cheap
It will aid in the separation of the sample solvent
It will not be separated by the chromatography solvent
It is readily available
Which compound would move furthest up a Silica Gel-Coated TLC plate?
Pentane
Benzene
Ethanoic acid
Dichloromethane
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