Paper Chromatography Technique Overview
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Questions and Answers

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?

  • 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?

  • 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?

<p>Because they interact more with the solvent (C)</p> Signup and view all the answers

How do compounds in a mixture behave in paper chromatography?

<p>They may separate into different spots depending on the solvent used (A)</p> Signup and view all the answers

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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Description

Learn about paper chromatography, a physical separation technique used to separate substances in a mixture based on their different solubilities. Discover how it works, the role of chromatography paper and solvent, as well as how pure compounds produce a single spot while mixtures can separate into different spots.

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