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I am going to investigate what can affect the rate of reaction of Potassium Iodide and Sodium Thiosulphate The outcome variable will be time, as I am investigating the rate of reaction, and therefore will need to measure the time taken until the reaction reaches a certain stage. A stopwatch is the best way to measure time elapsed, as I will be measuring time to an accuracy of one second. I will only be able to record the result at the end of the experiment, not several at intervals, for that is the only time a visible signal is at the end. However, I will repeat each experiment three times and take the mean, in order to gain the best average available in the time available to me. Factors That Can Affect Reaction Rates The following are the factors that affect the rate of a reaction: 1. Nature of the Ions Being Used....

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