Halogen Displacement

Halogen displacement experiments are common experiments in chemistry that involve the reaction between a halogen and a salt solution of another halogen. This experiment is useful in studying the reactivity of halogens and their displacement reactions. In this experiment, we will explore the reaction between potassium halide salts and halogen solutions. By following a few general steps and safety measures, we can observe and record the reaction and draw conclusions about the displacement reaction.

Experimental Details and Safety Measures:

Materials Needed:

  • Potassium halide salt (e.g., potassium chloride, KCl, potassium bromide, KBr, potassium iodide, KI)
  • Halogen solution (e.g., chlorine water, Cl2(aq), bromine water, Br2(aq), iodine water, I2(aq))
  • Spotting tile
  • Universal indicator paper
  • Safety goggles and lab coat


  1. Wear safety goggles and lab coat before conducting the experiment.
  2. Add a few drops of each potassium halide salt solution to 3 wells on the spotting tile.
  3. Add a few drops of halogen solution (e.g., chlorine water) to each well.
  4. Repeat the above step so that each halogen water has the opportunity to react with the potassium halide solutions.
  5. Observe and record the reaction in each well. A reaction is indicated by a change in color, the formation of a precipitate or gas bubbles. If you add a colorless liquid and the color of the other liquid gets lighter, it might just be dilution.
  6. Test the pH of the solutions in each well using universal indicator paper.
  7. Compare the results in each well. If a halogen displacement reaction has occurred, the halogen in the salt has been displaced by the halogen in the solution.

Safety Measures:

  • Wear safety goggles and lab coat to prevent any chemicals from coming into contact with your eyes and clothes.
  • Be careful while handling chemicals as some chemicals are harmful to your skin or can cause irritation.
  • Dispose of chemicals properly after the experiment to avoid any hazards.

By following the above procedure and safety measures, we can conduct a halogen displacement experiment and understand the reactivity of halogens in displacement reactions.


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