Determination of the Product Concentration at Various Times

In this example the dependence of rate constant k on [B] is obvious concentration up by a factor of two, rate constant up by a factor of two concentration up by a factor of three, rate constant up by a factor of three. . reaction is first order in B i.e. rate oc [B] and rate = k[A]2 [B] k can be found either 

numerically, since k=k /[B]. Using data in the second column gives 

Sometimes it is much easier to determine the product concentration than the reactant concentration, and the data must be converted into concentrations of reactant left at 

If the initial concentration was [S20 ]o at time, t = 0 then at time t, [S2O2-L=[S2O2-]0-y. 

Sometimes it is not necessary to convert from product concentration to reactant concentration, illustrated in the next problem (Problem 3.16). 

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