Why does ink move up chromatography paper?
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Keeping this in view, why do pigments move up the chromatography paper?
Separation of Plant Pigments Using Chromatography. The solvent carries the dissolved pigments as it moves up the paper. The pigments are carried along at different rates because they are not equally soluble. Therefore, the less soluble pigments will move slower up the paper than the more soluble pigments.
Secondly, why do amino acids move at different rates up the chromatography paper? Hydrophobic molecules will move faster because they are more attracted to the hydrophobic solvent than the hydrophilic paper. The different amino acids move at differing rates on the paper because of differences in their R groups.
Accordingly, why do some substances not move up chromatography paper?
Because they spend more time dissolved in the stationary phase and less time in the mobile phase, they aren't going to travel very fast up the paper. The tendency for a compound to divide its time between two immiscible solvents (solvents such as hexane and water which won't mix) is known as partition.
How is ink used in chromatography?
To perform ink chromatography, you put a small dot of ink to be separated at one end of a strip of filter paper. This end of the paper strip is placed in a solvent. The solvent moves up the paper strip and, as it travels upward, it dissolves the mixture of chemicals and pulls them up the paper.