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order of reaction

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1. why do we measure only the initial rate of the reaction to find the order and not take multiple points from the conc. time graph to plot on the conc. rate graph to find the order of the rxn?? does it matter or am i just confusing myself ?
2. (Original post by pondsteps)
why do we measure only the initial rate of the reaction to find the order and not take multiple points from the conc. time graph to plot on the conc. rate graph to find the order of the rxn?? does it matter or am i just confusing myself ?
when doing the experiment you would start with a known concentration of reactants and the aim is to find out the rate of the reaction with that concentration of reactant, you can then repeat with various other concentrations.

You can only find the reaction rate at your chosen concentration by taking the initial rate because after that the concentration of the reactant you're interested in will have decreased (some of it will have reacted!).So, if you just waited a while then measured rate again, then you would need to know how much reactant is left at that exact point, something which can be difficult to work out! That's why you take initial rates and repeat at different, known, concentrations

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Updated: September 19, 2016
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