Determining the Order of Reaction: With Respect to Potassium Iodide

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Determining the Order of Reaction: With Respect to Potassium Iodide

Now I have completed my experiments, I have all the data needed to calculate the order of reaction in relation to Potassium Iodide. As earlier highlighted in my research, the rate equation is:

m = order of reaction with respect to reactant A

n = order of reaction with respect to reactant B

In order to follow my calculations below, you may need to refer back to the relevant graph in the section titled Results, alternatively I have created a computerised version of the same graph and results table overleaf.

After I plotted the graph  against concentration of Potassium Iodide, (overleaf), I analysed it against the order graphs to see which it matched most closely, I noticed the line of best fit was very similar to the graph of first order.

I can also support this with points off the graph:

As seen above, when the concentration doubles so does the rate of reaction. Henceforth the rate of reaction is directly proportional to the concentration.

Therefore:                                                          [I-]1

Determining the Order of Reaction: With Respect to Hydrogen Peroxide

In order to follow my calculations below, you may need to refer back to the relevant graph in the section titled Results, alternatively I have created a computerised version of the same graph and results table overleaf.

After I plotted the graph  against concentration of Hydrogen Peroxide, (overleaf), I analysed it against the order graphs to see which it matched most closely, I noticed the line of best fit was very similar to the graph of first order.

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I can also support this with points off the graph:

As seen above, when the concentration doubles so does the rate of reaction. Henceforth the rate of reaction is directly proportional to the concentration.

Therefore:                                                          [H2O2]1

The overall rate equation is therefore:

Rate =  k [I-]1  [H2O2]1

The overall order of reaction is order 2, because the sum of the two orders equals 2. This is ...

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