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Questions and Answers
What is the purpose of using chromatography paper in paper chromatography?
What is the purpose of using chromatography paper in paper chromatography?
- To separate substances based on solubilities
- To act as the stationary phase (correct)
- To act as the mobile phase
- To dissolve the ink
Why is it important to draw the starting line in pencil in paper chromatography?
Why is it important to draw the starting line in pencil in paper chromatography?
- To help the ink move up the paper faster
- To increase the solubility of compounds
- To reduce the separation of substances
- To prevent ink from dissolving in the solvent (correct)
What happens if a pure compound is tested using paper chromatography?
What happens if a pure compound is tested using paper chromatography?
- It produces multiple spots in all solvents
- It doesn't produce any spots
- It produces different spots in different solvents
- It produces a single spot in all solvents (correct)
Why do more soluble substances travel further in paper chromatography?
Why do more soluble substances travel further in paper chromatography?
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How do compounds in a mixture behave in paper chromatography?
How do compounds in a mixture behave in paper chromatography?
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Study Notes
- Paper chromatography is a physical separation technique used by scientists to separate substances in a mixture based on their different solubilities.
- The process involves using chromatography paper as the stationary phase and a solvent as the mobile phase, with the solvent carrying the dissolved ink up the paper.
- A key point to note is that a pure compound will produce a single spot in all solvents, while compounds in a mixture may separate into different spots depending on the solvent used.
- Paper chromatography works because different substances have different solubilities, with more soluble substances traveling further than less soluble ones in the solvent.
- Drawing the starting line in pencil is essential to prevent the ink from dissolving in the solvent and moving up the paper, demonstrating the importance of using a pencil line.
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