Intended learning objectives.

By the end of this lecture, learners should understand how to use the Nernst equation to calculate equilibrium potentials in non-standard conditions and determine potentials for specific reactions like oxygen reduction and hydrogen evolution as pH varies. Learners should also appreciate the significance of Pourbaix diagrams, which illustrate the thermodynamic feasibility of reactions based on pH and potential, with a specific focus on the Pourbaix diagram for water. Additionally, they should be able to interpret these diagrams, identifying three regions that signify the stability of water, oxygen, and hydrogen species, particularly in the context of corrosion analysis. Lastly, learners should recognize the fundamental connection between the Nernst equation and Pourbaix diagrams .