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Electron transfer reactions in chemistry
Electron transfer is observed in a vast number of chemical reactions. Since electrons can be delivered by electrodes the electron transfer process provides an opportunity to drive chemical reactions at electrode surfaces. For this reason it is convenient to define the electron transfer reactions as half cell reactoins, which represent only the reduction (or electron accepting) process. Since oxidation (electron donating) is the opposite of reduction we reverse the direction of any of the reductoin reactions to find the corresponding oxidation. In this way we can use the tabulated half cell reactions to predict reactivity of electron transfer processes and to calculate the potentials that these processes would have if they were allowed to run in an electrochemical cell.
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In this lecture we will
- Define reduction and oxidation
- Identify reducing and oxidizing species in chemical reactions
- Define the half cell potential
- Demonstrate the balancing of redox reaction
- Introduce the relationship between the Gibb's free energy and the potential/li>
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