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This lecture covers the principles of chemical equilibria and reactivity, focusing on the variation of potential with pH in redox reactions, the corrosion of iron due to oxygen, protection against corrosion using different metals, titration methods, electrolysis, and Faraday's laws. It also explains the concept of electrolysis, the necessity of a higher voltage than the standard potential for non-spontaneous reactions, and the stoichiometry of products formed by an electric current.