Topic 11 Electrode potentials

• The standard hydrogen electrode is difficult to set up so it’s easier to choose a more convenient secondary standard. Secondary standard is calibrated against the standard hydrogen electrode
• ELectrochemical cells contain 2 electrodes, each electrode has its own half-reaction. Oxidation occurs at the anode. Reduction occurs at the cathode
• Where does oxidation occur on an electrochemical cell? [1]

  anode
• Where does reduction occur on an electrode cell? [1]

  cathode
• What are the conditions needed for the standard hydrogen electrode? [4]

  Temperature - 298k

  Solution concentration - 1 mol wrt ions

  Gases - 100kpa

  Salt bridge - filled with saturated potassium chloride
• What are the factors that affect cell potential? [3]

  Temperature

  solution concentration

  pressure of any gases
• The calomel electrode contains hg2cl2