Investigating what happens when aqueous solutions undergo electrolysis
1. Pour approximately 50 cm³ of copper(II) chloride solution into a beaker
2. Place a plastic petri dish with two holes over the beaker
3. Insert a carbon graphite rod into each hole (electrodes)
4. Attach crocodile leads to the rods and connect to a low-voltage power supply
5. Select 4 volts on the power supply and switch it on