Introduction of Electrochemistry
Electrochemistry is a field of chemistry that studies chemical reactions which take place at the interface of an electron conductor (a metal or a semiconductor) and an ionic conductor (the electrolyte) in a solution, and that involve electron transfer among the electrode and the electrolyte or species in solution.
It is an electrochemical reaction when, By an external applied voltage if a chemical reaction is driven, like in electrolysis or by a chemical reaction if a voltage is created like in a battery. It is different from the chemical reactions in which electrons are transferred among molecules are called oxidation/reduction (redox) reactions. In general, electrochemistry deals with situations where reduction and oxidation reactions are separated in space/time that is connected by an external electric circuit.
Principles
Redox reactions: for reduction-oxidation we use Redox and are electrochemical processes involving transfer of electron to or from a molecule or ion changing its oxidation state. From the application of an external voltage or from the release of chemical energy this reaction can take place.
Oxidation and reduction: the change of oxidation state that takes place in the atoms is explained by Oxidation and reduction. In an electrochemical reaction the ions/molecules are involved. In formal, the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic is known as oxidation state. An atom or ion that gives up an electron to another atom or ion has its oxidation state increase and the recipient of the electrons that are negatively charged has its oxidation state decrease. Oxidation and Reduction always occur in a paired fashion such that one species is oxidized when another is reduced. A redox reaction is the transfer of this paired electron.
Balancing redox reactions: The Electrochemical reactions in water are better understood by balancing redox reactions using the ion-electron method where H+, OH- ion, H2O and electrons (to compensate the oxidation changes) are added to half-reactions of cell for oxidation and reduction.
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