Starter quiz
- Which of the following is not part of preparing a chromatography paper?
- drawing a sample line
- adding a small volume of solvent
- heating the paper ✓
- marking the solvent front
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- Why do we use pencil to draw the sample line in chromatography?
- pencil marks dissolve in the solvent
- pencil is more visible than ink
- pencil marks do not travel with the solvent ✓
- pencil reacts with the inks to help them separate
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- What is the purpose of the stationary phase in chromatography?
- to move the solvent
- to absorb the solvent
- to hold the substances as they separate ✓
- to change the colour of the inks
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- True or false? The solvent front should be marked after the paper is removed from the container.
- True ✓
- False
- True or false? If two substances have the same Rf value then they must be the same substance.
- True
- False ✓
- Calculate the Rf value of a spot that travels 55 mm up from the sample line, where the chromatogram shows a solvent front of 86 mm.
- '0.64' ✓
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