OXIDATION –REDUCTION
REACTION
DEFINITION
•Oxidation –reduction reaction (abbreviated “redox” reaction )
is a chemical reaction, in which electrons are transferred
between reactants and the oxidation states of atoms are
changed.
Redox reaction involves:
oOxidation: loss of electrons
Ox1+ e →Red1( S +2e →S2-)
Reducing agents: Substance that cause oxidation by
being oxidized
oReduction: Gain of electrons
•Red2–e →Ox2( Fe –2e →Fe2+)
Oxidizing agents: Substance that cause oxidation by
being oxidized
Reduction and oxidation
•Oxidation and reduction always occur
simultaneously
•Redox couple is the pair of oxidizing and
reducing agents that are involved in a
particular reaction.
•AFFECTING FACTOR INTO SUBSTANCES’S REDUCTION AND
OXIDATION PROPERTIES
•Reduction and oxidation potential of substances depend
on:
•1. Electron configuration and oxidation state of
elements and ions. (Periodic table)
•2 –Periodic trend of non- metal and metal elements
(Periodic trend of electronegativity)
•3- Steady properties of substances.
•4- Environment properties (acidic, basic or neutral)