Air law

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Q#9.1: How order of reaction is experimentally determined.

Ans.Order of reaction is determined by the following two methods.

1.From Rate Law. In this method first the rate of reaction is measured by using chemical and physical methods (volumetric, gravimetric, spectrophotometer, PH-meter, conductometric methods). From the dependence of rate of reaction on concentration of reactants tell us about the order of reaction. For example a reaction in which by doubling the concentration of reactants, the rate of reaction becomes double too, will be of first order. If the rate increases four times by doubling the concentration, the reaction will be of 2nd order.

2.Ostwald’s Isolation Or Large excess method.

This method is used to determine the order of complicated reactions. A reaction having two or more different reactants, the order can be found by considering the rate of reaction for one reactant, keeping the concentration of remaining reactants constant. The same procedure is then applied to other reactants and so on.

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