Thursday, 21 June 2018

STOICHIOMETRY AND REDOX REACTIONS NOTE BY PLANCESS

Stoichiometry of redox reactions means calculation of the quantities of the oxidising and reducing agents and their products in oxidation-reduction reactions.

Stoichiometric calculations in redox titrations are carried out by using molarity equation. In both these methods, we need a balanced equation for the redox reaction. The stoichiometric coefficients in the balanced equation tell us the ratio by moles in which the reactants combine and the products are formed.

In the titration method, the molarity equation, i.e.,
M1 V1 / n1 = M2 V2 / n2         
is used where M1 and M2 are the molarities of the reductant and oxidant or vice-versa and V1 and V2 are their volumes and n1 and n2 represent their stoichiometric coefficients. This equation can be used to calculate any unknown quantity if the other three quantities are known.

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