Reaction of Halogens

• Halide - compound containing halogen
• Displacement reactions happen when a more reactive elements displaces (takes the place of) the less reactive element of its compound

Halogen Displacement Practical

Health and Safety

• Wear eye protection
• Wash off splashes of solutions that contact skin immediately, wipe up other spills
• Do not inhale halogen vapours
• Iodine will stain skin and clothes

Method

• Add 1-2 drops of distilled water to a column on a spotting tile - this is our control
• Add 1-2 drops of each halide solution to a column of the spotting tile
  • The halide solutions should be:
    • Potassium Chloride
    • Potassium Bromide
    • Potassium Iodide
• Add 1-2 drops of halogen solution to a row of the spotting tile
  • The halogen solution should be:
    • Chlorine water
    • Bromine water
    • Iodine water
• Record each observation

Predicted results

• It should be chlorine being the most reactive and iodine the least reactive

Chlorine Water

• Distilled Water - no effect
• Potassium Chloride - no effect
• Potassium Bromide - displaces bromine, forms potassium chloride, the solution should be pale yellow colour
• Potassium Iodide - displaces iodine, forms potassium chloride, the solution should be a pale yellow colour

Bromine Water

• Distilled Water - no effect
• Potassium Chloride - no effect
• Potassium Bromide - no effect, solution should be a pale yellow colour
• Potassium Iodide - displaces iodine, forms potassium bromide, solution should be a light orange colour

Iodine Water

• No effect on any substance, should turn all the solutions into a light orange colour