Electrolysis

    Cards (21)

    • What should you be able to describe by the end of the video?
      How to investigate electrolysis of solutions
    • Why is it recommended to watch two videos before starting the protocol?
      To understand electrolysis of aqueous solutions
    • What are the two aqueous solutions used in the electrolysis experiment?
      • Copper(II) chloride
      • Sodium chloride
    • How much copper(II) chloride solution is poured into the beaker?
      Approximately 50 centimeters cubed
    • What is the purpose of the plastic petri dish in the experiment?
      To cover the beaker during electrolysis
    • What material are the electrodes made of?
      Carbon graphite
    • Why are the carbon graphite electrodes considered inert?
      They do not react during electrolysis
    • What happens if the two electrodes touch each other?
      A short-circuit will occur
    • What voltage is selected on the power supply during the experiment?
      Four volts
    • What is observed at the cathode during the electrolysis of copper(II) chloride?
      Copper is being coated on the electrode
    • Why is copper discharged at the cathode?
      It is less reactive than hydrogen
    • What gas is produced at the anode during the electrolysis of copper(II) chloride?
      Chlorine gas
    • What happens to blue litmus paper when exposed to chlorine gas?
      It becomes bleached
    • What are the products formed when electrolyzing copper(II) chloride solution?
      • Copper at the cathode
      • Chlorine gas at the anode
    • What is the procedure for the second experiment with sodium chloride solution?
      Repeat the electrolysis setup with sodium chloride
    • What gas is produced at the anode during the electrolysis of sodium chloride?
      Chlorine gas
    • What gas is produced at the cathode during the electrolysis of sodium chloride?
      Hydrogen gas
    • Why is hydrogen gas discharged at the cathode during sodium chloride electrolysis?
      Sodium is more reactive than hydrogen
    • How can you test if the gas produced at the cathode is hydrogen?
      By collecting it and using a lit splint
    • What sound does hydrogen gas produce when tested with a lit splint?
      A squeaky pop
    • What are the key observations during the electrolysis of sodium chloride solution?
      • Chlorine gas at the anode (bleaches litmus)
      • Hydrogen gas at the cathode (produces squeaky pop)