Basics of Redox Reaction

Basics of Redox Reaction
What is Redox reaction?
A chemical reaction which involves the exchange of electrons between any two species is called redox reaction (oxidation-reduction). It is a reaction where the oxidation
number of an ion, atom or molecule changes either by losing or gaining an electron.

These reactions are common and important for some basic functions in life such as
respiration, photosynthesis, corrosion, combustion, etc.
What is Oxidation?
When an ion, atom or molecule loses electrons during a chemical reaction it is called
oxidation reaction. This reaction occurs when the oxidation state of an ion, atom or
molecule is increased.
What is Reduction?
When an ion, atom or molecule gains electrons during a chemical reaction it is called a
reduction reaction. This reaction occurs when the oxidation state of an ion, atom or
molecule is decreased.
Redox reaction examples
Formation of hydrofluoric acid by the reaction of hydrogen and fluorine gas. The
reaction is as follows:
H2 + F2
 → 2 HF
Hydrogen is oxidized whereas fluorine is reduced. To understand the reaction better,
divide it into two half-reactions:
H2
 → 2 H+ + 2 e- F2
 + 2 e- → 2 F- What are Oxidizers?
Substances that are responsible to lose electrons of other substances are called
oxidizers. They are able to oxidize substances. They are also known as oxidizers,
oxidants or oxidizing agents. It is reduced by removing electrons from other substances.
Also, since it accepts electrons it is called an electron acceptor. These chemical
substances include elements of high oxidation state such as H2O, CrO3, etc.
You are reading the "Basics of Redox Reaction".

What are reducers?
Substances that are responsible to gain electrons of other substances are called
reducers. They are able to reduce substances. They are also known as reducers,
reductants or reducing agents. It is oxidized by transferring electrons to other
substances. Also, since it donates electrons it is called an electron donor. Some
examples of reducing agents are sodium, zinc, lithium, aluminium, etc.
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