Electrode Potentials, AQA, A2

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  • Electrode Potentials
    • Calculating E Cell
      • Cell diagram
        • ECELL = Erighths - Elefths
        • Pt/H2/H+  cell
          • Used as a standard
      • Electrochem series
        • Most positive - least positive
      • E.G.
        • CL2 + 2e=2Cl-
          • +136V
            • Most positive - least positive
              • -0.76V
              • 1.36-(-0.76)
                • =2.12
        • Zn2+ + 2e=ZN
          • -0.76V
      • If Ecell is positive, reaction is feasible.
        • =2.12
    • Cell Diagrams
      • Pt/Fe2+,Fe3+ :: Ag1+/Ag
        • / = Change in state
        • :: = salt bridge
        • Ecell= Erhs-Elhs
        • Right side is most positive
    • Cells
      • Pt electrode
        • Good solid conductor
        • Is inert
      • High resistance voltmeter
        • used to stop current
        • To measure highest pH
      • Standard coditions
        • 1M solutions
        • 298K / 25'c
        • Standard pressure 100 KPA
      • Salt bridge- KNO3
        • Completes circuit, allows ions to diffuse
    • Reducing / Oxidising agents
      • Best Reducing agent = Zn
        • best at gaining electrons (most - Ecell)
      • Best Oxidising agent = F2
        • Bst at loosing electrons (most + Ecell)
      • OIL RIG

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