| Oxidation | Loss of electrons in redox accounting |
|---|---|
| Reduction | Gain of electrons in redox accounting |
| Must conserve | Mass and charge |
Definition and context
A redox reaction combines oxidation and reduction. In terms of electron accounting, one species gives up electrons and another receives them. Oxidation states help track this accounting, although they do not always represent full physical charges within a molecule.
The concept is useful when we want to explain where a cell’s current comes from. Separating processes and connecting a circuit makes it possible to organize a chemical transformation to obtain an electrical output. To analyze a specific reaction, we need the species and conditions, as well as conservation of mass and charge. A correctly balanced equation is a starting point: by itself, it does not tell us how fast the process occurs or how long a real device will last.
What we know and its limits
Introductory reference sheet. Properties and applications depend on measurement conditions; consult the sources before making comparisons.
Follow the evidence
The original sources for exploring this explanation and its limits.
- Chemistry 2e · Redox Reactions
OpenStax · Rice University
Oxidation, reduction, and electron balancing. - Chemistry 2e · Potential and Free Energy
OpenStax · Rice University
Relationship between electrochemical potential and energy.
Image credits
Photo by Ron Lach on Pexels · Original source · Pexels License