TLC Experiment Discuss the reason behind different Rf values of dyes by consider
ID: 1051199 • Letter: T
Question
TLC ExperimentDiscuss the reason behind different Rf values of dyes by considerng chemical structures and possible interactions (like dipole-dipole, H bond, london forces etc.)
Rhodamine B - water Rf=0.039 Rhodamine B- ethanol Rf=0.3955 Rhodamine B- silica gel (discuss only interactions between them)
Amaranth O- water Rf=0.9555 Amaranth O- ethanol Rf=0.6455 Amaranth O- silica gel (discuss only interactions between them) TLC Experiment
Discuss the reason behind different Rf values of dyes by considerng chemical structures and possible interactions (like dipole-dipole, H bond, london forces etc.)
Rhodamine B - water Rf=0.039 Rhodamine B- ethanol Rf=0.3955 Rhodamine B- silica gel (discuss only interactions between them)
Amaranth O- water Rf=0.9555 Amaranth O- ethanol Rf=0.6455 Amaranth O- silica gel (discuss only interactions between them) TLC Experiment
Rhodamine B - water Rf=0.039 Rhodamine B- ethanol Rf=0.3955 Rhodamine B- silica gel (discuss only interactions between them)
Amaranth O- water Rf=0.9555 Amaranth O- ethanol Rf=0.6455 Amaranth O- silica gel (discuss only interactions between them)
Explanation / Answer
Interaction sof yes with solvent in tlc
Rhodamine B-water form strong H-bonding and this would lower tne Rf value.
Rhodamine B-Ethanol again forms hH-bonding that would reduce the Rf value
RhodmanineB-Silica gel : polar=polar iteractions, H-bonding between due asnd -OH of silica.
Amaranth O-water : Amaranth is non-polar and does not form H-bonding, shows lodon forces of attraction and thus Rf is high.
Amaranth O-ethanol : again shows weak london force of attraction slightly strognger then wht we found in water which is why Rf value is lower as less polar solvent ethanol than water.
Amaranth O-silica gel : would show, london disperson force of attraction and no strong other forces which would increase the Rf value.
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