required practical 3: electrolysis

• steps

  1. 50cm cubed of copper chloride solution in a beaker
  2. use a petri dish with two holes as a lid
  3. insert two carbon grahite rods ( electrodes )
  4. they can not touch or it will produce a short circuit
  5. connect rods to crocodile leads then connect to a low voltage power supply
  6. turn it on to 4 volts
  7. anode: chlorine gas (halogen)
  8. cathode: copper
  9. repeat with sodium chloride
• electrolysis of an aqueous solution

  • anode : oxygen is produced unless halide ions are present
  • cathode: hydrogen will be produced unless the metal is less reactive than hydrogen