Reaction Rate experiment: Potassium Permanganate and Hydrogen Peroxide

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TL;DR Summary
Relationship between reaction rate and concentration when Potassium Permanganate reacts with excess Hydrogen Peroxide in acidic medium.
I am picking up on an old thread having revisited the associated experiment.

https://www.physicsforums.com/threa...ganate-and-hydrogen-peroxide-solution.992713/

10ml of Permanganate solution (0.0135 mol/liter) were reacted with 10ml of Peroxide and 10ml of vinegar. The peroxide was in excess so all the permanganate reacted changing from purple to colourless. This colour change was timed for various dilutions of the permanganate. For example, one run would consist of 8ml stock permanganate and 2ml distilled water reacted with the 10ml peroxide and 10ml vinegar. Constant volume of 30ml was thus maintained.

Reaction rate was determined as [KMnO4] / t . and plotted against [K Mn O4]. I'm not sure how valid it is to plot x/t vs x but that's what we did yielding following data and graph. Well it seems to show a pretty good exponential fit and my question is where does that come from? Have trawled the internet but can't find anything similar except maybe the well know sodium thiosulphate reaction rate experiment.

https://www.desmos.com/calculator/fdkytmcxgy

1719039385199.png
 
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