Applied Chemistry I: UNIT 3: Electrochemistry
Redox Reactions
Reactions in which oxidation and reduction takes place simultaneously are known as redox reactions.
REDOX REACTIONS
Reactions in which
oxidation and reduction takes place simultaneously are known as redox
reactions.
Oxidation
It is a process, which
involves loss of electrons by a substance. Oxidation occurs at the anode.
Reduction
It is a process, which
involves gain of electrons by a substance. Reduction occurs at the cathode.
It is known that if a
substance loses electrons, another substance must accept these electrons. Similarly,
if a substance accepts electrons, another substance must supply these
electrons. Thus, redox (oxidation and reduction) reactions always go side‒by‒side.
1. Illustration
Zinc metal in copper sulphate solution
If zinc metal is placed
in a copper sulphate solution, the following oxidation and reduction reactions
takes place.
Oxidation
Zinc atom (Zn) loses
two electrons and gets oxidized to zinc ion (Zn2+).
Zn(s) → Zn2+(aq)
+ 2e‒
Reduction
Copper ion (Cu2+)
gains two electrons, liberated by Zn and gets reduced to copper (Cu).
Cu2+(aq)
+ 2e‒ → Cu (s)
Each of the above
reactions is known as half reaction. The reaction, in which loss of electrons
takes place is called oxidation half‒reaction,
while the reduction, in which gain of electrons takes place is called reduction half‒reaction.
Overall
redox reaction
It is obtained by
adding the two half‒reactions, Thus,
Applied Chemistry I: UNIT 3: Electrochemistry : Tag: Applied Chemistry : - Redox Reactions
Applied Chemistry I: UNIT 3: Electrochemistry
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Applied Chemistry I
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