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Sodium Thiosulphate Investigation Introduction: This is an investigation into the reaction speeds of Sodium Thiosulphate [Na S O] under different conditions. We will be using a catalyst, which is Hydrochloric Acid [HCl]. Na S O + HCl ==> 2NaCl + SO + S + H O When the two chemicals are mixed the Sulphur slowly forms as a solid, but it does not precipitate out in the usual way. The time for a given amount of reaction can be found by checking the cloudiness of the mixture. The way in which we can find out the rate of reaction is by timing the reaction and finding out how long it takes for the liquid to become opaque under the conditions we set, then we divide the change by the time. Then we will find out the effect of one factor on the reaction by only changing one input variable and keeping the rest constant. There are...

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