Aqueous solutions

• • At cathode, if H+ ions and metal ions are present, hydrogen will be produced if metal is more reactive than hydrogen
  • If metal is less reactive than hydrogen, metal will be formed
• at anode:

  • if OH- ions and halide ions are present, chlorine, bromine, iodine will be formed
  • if no halide ions are present, oxygen is formed
• • gas tests can be used after electrolysis to test what product was produced:
  • chlorine bleaches damp litmus paper
  • hydrogen makes squeaky pop with lit splint
  • oxygen will relight glowing splint