Electrolysis

• What is the aim for this practical?

  To investigate electrolysis of an aqueous solution (e.g., copper chloride or sodium sulfate).
• The steps:

  • Pour the solution into a beaker.
  • Insert carbon electrodes and connect to a power supply.
  • Allow electrolysis to occur and observe the products at each electrode.
  • Test gases produced (e.g., hydrogen pops with a lit splint, oxygen relights a glowing splint).
• What is the independent variable?

  Type of electrolyte used.
• What is the dependent variable?

  Products formed at the electrodes.
• What is the control variable?

  Voltage, electrode material.