Saturday, July 30, 2011

Law of Mass Action

The law of mass action was given by two Norwegian Chemists Gulberg and Waage in 1867 which states,
 “At constant temperature the rate of a chemical reaction is directly proportional to the product of the molar concentrations of reactants each term raised to the power equal to the Stoichiometric co-efficient as represented by balanced chemical equation.”
Let us consider a chemical reaction
aA    +   bB      Product.
Where a, b are stoichiometric co-efficients.
Then,
According to law of mass action,
Rate of reaction, (r) ยต  [A]a[B]b
Where [A] and [B] are molar concentration of A and B.
\        r   =   K[A]a[B]b

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