Displacement reactions of halide ions by halogens.

• Table of displacement.

  Chlorine will displace both bromide and iodide ions; bromine will displace iodide ions

  
• Colour of solution in the test tube shows which free halogen is present.

  Chlorine =very pale green

  solution (often colourless),

  Bromine = yellow solution

  Iodine = brown solution (sometimes black solid

  present)
• Displacement reactions of halide ions by halogens equations.

  Cl2 (aq) + 2Br- (aq) -> 2Cl- (aq) + Br2 (aq)

  Cl2 (aq) + 2l- (aq) -> 2Cl- (aq) + I2 (aq)

  Br (aq) + I2- (aq) -> 2Br- (aq) + I2 (aq)