An extra point about second order reactions

2 An extra point about second order reactions 

The analyses given above apply to reactions of one molecular species, i.e A — products, or A + A — products. But what about reactions such as A + B — products, where both [A] and [B] decrease steadily with time and the rate is proportional to the concentrations of both A and B  

The second order integrated rate equation quoted earlier only applies to this case if [A] = [B]. If unequal concentrations of A and B are used, the integrated rate equation 

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