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Sodium thiosulphate + hydrochloric acid → sodium chloride + water + sulphur + sulphur dioxide

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Introduction

Disappearing cross - Planning Aim To investigate how temperature affects the rate of the chemical reaction: Sodium thiosulphate + hydrochloric acid � sodium chloride + water + sulphur + sulphur dioxide Na2S2O3 (aq) + 2HCl (aq) � 2NaCl (aq) + H2O (l) + S (s) +SO2 (g) Scientific Principle - Collision theory Collision theory states that molecules must collide before they react. Not only must they collide but they must also collide with enough energy in order for a reaction to occur. The energy required for a successful reaction is called the Activation Energy. There are four factors that dictate the number of collisions and therefore the amount of successful reactions: * Temperature * Surface area * Concentration * The presence of a catalyst Our experiment aims to show how temperature affects the rate of reaction while the other factors remain constant. ...read more.

Middle

Pour 20ml of Sodium Thiosulphate into a separate tube. Draw a large cross on a piece of paper and place a beaker over it. Pour the contents of the 2 test tubes into the beaker at the same time; the process of pouring at the same time effectively stirs the reactants. Measure with a stopwatch the time between pouring the reactants into the beaker and the cross underneath the beaker being no longer visible. Record this time and wash out the beaker. For the different temperatures just do the same but before you pour the contents of the tubes into the beaker, put them both in the water bath. ...read more.

Conclusion

Preliminary work To decide which concentration of Sodium Thiosulphate to use we conducted some preliminary work. We decided to use 20ml of Sodium Thiosulphate and 30ml of water as it wasn't too slow but would not be too quick on the higher temperatures. Prediction I predict that as the temperature increases by 10�C, the time will half and the rate will double. This is because as the temperature rises the molecules become more agitated, moving faster and colliding more with greater energy producing more successful reactions. Safety Sulphur dioxide gas is poisonous. As soon as the experiment is complete, the reaction mixture must be disposed of with lots of running water and the glassware is to be rinsed. Eye protection must be worn when acid is being handled in the lab. ...read more.

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