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Lecture 23 - Lecture 23Oxidation and Reduction Definitions...

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Lecture 23—Oxidation and Reduction Definitions: oxidation is the removal of electrons from an atom, ion, or molecule, and reduction is the addition of electrons to an atom, ion, or molecule. These reactions are also called redox. Reactions where electrons are transferred are another special case of equilibrium reactions. Just as in the case of acids, where protons are transferred rather than existing in isolation, electrons are also transferred. They do not exist isolated in solution. Electron transfer reactions are composed of two redox “couples”. One couple undergoes the oxidation process, and the other couple undergoes the reduction process. Each step in a redox process can be expressed as a “half reaction”, with the electron on the left side of an equilibrium expression, for example Cl + e- ↔ Cl-. Adding the oxidation and the reduction process together, each as a balanced equation, gives an expression for the net reaction.
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