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  Redox Couple

Redox Couple:

All the time every oxidation is accompanied via a reduction process. All such types of reactions are known as oxidation-reduction reactions and shortly considered as redox. These redox (oxidation-reduction reactions) reactions are related with movements of electron. The electron donor is known as reductant/reducing agent and the electron acceptor, the oxidant or oxidizing agent. The system that transfers its electron is changed into oxidant form when the system that accepts electrons gets converted to the reductant form. Oxidation reduction system is simplified and displayed below in the diagram.

2228_oxidation reduction.jpg


 
                                                                 Diagram: Oxidation-Reduction System


Electron donor → e-  + electron acceptor

A particular example is oxidation of ferrous iron to ferric iron points out the removal of electron (e-) from ferrous iron.

Fe + + →  Fe +++ + e-
(Ferrous ion)    (Ferric ion)

Because, the electron is unstable in the free form it gets connected to other molecule and so every oxidation is followed via a reduction. All the time these redox reactions are energy yielding. An electrons’ direct transfer from substrate to the oxidant would liberate an unexpected burst of energy and most of it will be wasted via dissipation. Generally while the electrons of hydrogen combine along with oxygen results in explosion. In biological system this oxidation reduction procedure occurs smoothly with no increasing the temperature since the transfer of hydrogen pairs takes place in a step by step process till it reacts with oxygen. This allows the liberation of energy in small amounts that is why it can be captured and saved.

 

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