Electrodes

• Method

  1. First using sandpaper, clean the metal electrodes.
  2. Then degrease all the metal electrodes
  3. Pour the two different metal sulphate solutions into two separate beakers using a measuring cylinder
  4. Place the metal electrode in the corresponding solution
  5. Then cut out a line of filter paper and soak it in KNO3 solution and place in each end of the beaker.
  6. Connect the electrodes to a voltmeter using crocodile clips and record results
  7. If results is positive then switch the crocodile clips
• Why do you use sandpaper to clean electrodes?

  To remove oxide layer on the metal
• Why do we degrease the metal electrode?

  The grease can prevent the cell from working efficiently
• What's the filter paper soaked in KNO3 used for?

  Its the salt bridge that allows the ions in the solution to flow