CHAPTER 21: Electrode Potentials

CHAPTER 21: Electrode Potentials

  • Standard Electrode Potential
  • Measuring Standard Electrode Potential
  • Using E° Values
  • Cells and Batteries
  • Quantitative Electrolysis

 

  • define the terms:
    • standard electrode (redox) potential
    • standard cell potential
  • describe the standard hydrogen electrode
  • describe methods used to measure the standard electrode potentials of:
    • metals or non-metals in contact with their ions in aqueous solution
    • ions of the same element in different oxidation states
  • calculate a standard cell potential by combining two standard electrode potentials
  • use standard cell potentials to:
    • explain/deduce the direction of electron flow from a simple cell
    • predict the feasibility of a reaction
  • construct redox equations using the relevant half-equations.
  • predict qualitatively how the value of an electrode potential varies with the concentration of the aqueous ion
  • state the possible advantages of developing other types of cell, g. the H2/O2 fuel cell and improved batteries (as in electric vehicles) in terms of smaller size, lower mass and higher voltage.
  • state the relationship, F = Le, between the Faraday constant, the Avogadro constant and the charge on the electron
  • predict the identity of the substance liberated during electrolysis from the state of electrolyte (molten or aqueous), position in the redox series (electrode potential) and concentration
  • calculate:
    • the quantity of charge passed during electrolysis
    • the mass and/or volume of substance liberated during electrolysis, including those in the electrolysis of H2SO4(aq), Na2SO4(aq).
  • describe the determination of a value of the Avogadro constant by an electrolytic method