Chapter 8 Electrochemical Cell

1
Chapter 8 Electrochemical Cell

• A chemical reaction produces an electric
  potential difference between two electrodes.
• The chemical reactions occurring at the two
  electrodes cause a flow of electrons in the outer
  circuit .
• The Daniell Cell
• A potential difference is referred to as the
  electromotive force (emf) of the cell.

2

• Based on IUPAC, the hydrogen electrodes is placed
  on the left-hand side, and the emf of the other
  electrode is taken to be that of the cell.
• gt standard electrode potentials ?H2 ?????????

3

• Thermodynamics of Electrochemical Cells
• Gibbs Energy Change in a Cell
• For any standard-cell reaction associated with
  the passage of z electrons and an emf of Eo , the
  change in Gibbs energy is
• ?Go -zFEo
• ?G -zFE

4

• The Nernst Equation
• AaBb?yYZz