paper chromatography

• What is the purpose of paper chromatography?

  To separate substances in a mixture
• What are some methods scientists use to separate mixtures?

  Filtration, crystallisation, distillation, chromatography
• What is chromatography?


  A technique to separate mixtures
• What type of chromatography is discussed in this video?

  Paper chromatography
• What does paper chromatography separate substances based on?

  Different solubilities of substances
• How can you determine if a pen contains a single color or a mixture?

  By observing the number of spots formed
• What is the stationary phase in paper chromatography?

  The paper that does not move
• What is the mobile phase in paper chromatography?

  The solvent that moves up the paper
• What happens to the ink when the solvent moves up the paper?

  The ink dissolves and travels with the solvent
• What does a single spot indicate in chromatography?

  The substance is a pure compound
• What does it mean if a color separates into multiple spots?

  It indicates a mixture of different colors
• How does the solubility of a substance affect its movement in chromatography?

  More soluble substances travel further
• Why do we draw the starting line in pencil?

  To prevent the line from dissolving in the solvent
• What will happen to the red color spot in different solvents?

  It will still produce a single spot
• What is the significance of the RF value in chromatography?

  It helps identify a compound
• What are the key facts about paper chromatography?

  • It is a physical process.
  • No new substances are created.
  • The paper is the stationary phase.
  • The solvent is the mobile phase.
  • More soluble substances travel further.
• What are the steps involved in performing paper chromatography?

  1. Draw a pencil line on chromatography paper.
  2. Place dots of different colors on the line then place paper in a beaker of solvent making sure the ink doesn’t touch the solvent.
  3. place a lid on top of container to stop solvent from evaporating.
  4. Observe the movement of colors up the paper.
  5. when solvent has nearly reached the top of the paper, take it out and let it dry.
  6. Analyse the number of spots formed.