Contents Page Page Title 1 Planning 2 Method and prediction 3 Diagram 4 Results for temperature and concentration on Tables 5 Graph for results for rate of reaction against temperature 6 Graph of results for rate of reaction against time 7 Graph for concentration results 8 Graph and table of typical results 9 Conclusion and Evaluation… 10 End of evaluation This investigation is about Rates of Reaction and what affects them. In this case I am going to look at hydrochloric acid and sodium thiosulphate, which is a precipitation reaction. I will be investigating whether a change in temperature affects the rate of reaction. (Planning) Sodium thiosulphate and hydrochloric acid react together to produce sodium chloride, sulphur dioxide, water and sulphur. This is also shown in the word and symbol equations below: Word: Sodium thiosulphate + Hydrochloric acid Sodium chloride + sulphur dioxide + water + sulphur Symbol: Na2S2O3(aq) + 2HCl(aq) -* 2NaCl(aq) + S(s) + SO2(g) + H2O(l) Both of these solutions are colourless. They react to produce a solid (sulphur, which is the yellow precipitate), and as it cannot dissolve in water, the solution will become cloudy. A reaction will only occur where the particles of the reactants meet and combine. This is called the collision theory. Therefore it stands to reason that to increase the rate of reaction it is necessary to cause more particles to collide harder and make it happen more often. There are several ways to do this and these make up the variables for this experiment. 1) Increasing the temperature — Increasing the temperature of the reactants will provide the particles with more kinetic (movement) energy. This will make the particles move faster. The number of successful collisions per second will also increase; hence the rate of the reaction increases. More collisions have an energy gr…
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