how to get the reaction rate (V) on an excel graph.

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I have plotted a graph showing the absorbance values against the time on a graph.

how do i then calculate and show the reaction rates on the graph?

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If A0 is the absorbance at t=0, Ainf is the “final absorbance” (at “Infinite time”), A is the absorbance at some time, you can plot: ln((A-Ainf)/(A0-Ainf)) vs time and it should give you a straight line whose slope is -k (the negative of the rate constant) for a first order reaction.

Steve

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