Paper Chromatography
- Created by: Julia V
- Created on: 21-06-18 19:38
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- Chromatograp
- Can be used to separate different dyes in an ink.
- Method
- 1) Draw a LINE near the bottom of a sheet of filter paper. Use pencil as pencil marks are insoluble and won't dissolve ion the solvent
- 2) Add a spot of the ink to to the line and place the sheet in a beaker of solvent e.g Water
- 3) Make sure the ink isn't touching the solvent to make sure it doesn't dissolve into it.
- 4) Place a LID on top of the container to stop the solvent from evaporating.
- 5) When the SOLVENT has nearly reached the TOP of the paper, take the paper out of the beaker and leave it to DRY.
- Practical
- The solvent SEEPS up the paper, carrying the ink with it.
- Each different DYE in the ink will move up the paper at a DIFFERENT rate so the dyes will SEPARATE OUT.
- INSOLUBLE dyes in the ink will stay on the baseline
- The end result is a pattern of spots called a chromatogram
- Rf Value
- Distance travelled by substance / Distance travelled by Solvent
- Dependent on the solvent you use
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