The aim of the experiment is to find out the effect of different :: GCSE Chemistry Coursework Investigation

The aim of the experiment is to find out the effect of different concentrations of reactants on rate of reaction. Rates of Reaction Aim The aim of the experiment is to find out the effect of different concentrations of reactants on rate of reaction. I will find this out by doing an experiment. The reaction that will be used is: Sodium Thiosulphate + Hydrochloric Acid Na2S2O3 + 2HCl Equipment The equipment I will use to do this experiment is:  · Goggles  · Test tubes  · Beakers  · Hydrochloric Acid  · Sodium Thiosulphate  · Water  · X marked paper Background Information The Collision Theory is when particles collide with enough energy to break their bonds if they are to react. Collision means when two particles hit each other. Breaking a solid exposes new surfaces, the smaller the pieces the greater the surface area. Safety Measures A pair of goggles will be worn in order to protect the eyes. Fair Test In order for my findings to be valid the experiment must be fair. I will use the same standard each time for judging when the X has disappeared. I will make sure that the measuring cylinders for the Hydrochloric acid and Sodium Thiosulphate will not be mixed up. The amount of Hydrochloric acid will be 10cm3 each time. Prediction I predict that by increasing the concentration of one of the reactants the rate of reaction will increase because they are likely to collide quicker. Method I first of all start of by wearing goggles as Hydrochloric Acid is an irritant to the eyes. After that I got all equipment out I needed to perform this experiment. Test Tube Beaker X marked paper I firstly put 10cm3 of hydrochloric acid into the beaker which I measured with the test tube. After I put the x marked paper under the beaker. I then poured in the volume of Sodium Thiosulphate and the concentration of it which was 50cm3. Set off the stopwatch and waited to see when the x marked paper is not visible. I repeatedly did this 3 times for each one. Finally, I recorded the results on a results table. Conclusions My results show that if you add more concentration of sodium Thiosulphate and less water to the hydrochloric acid the particles collide more because so the rate of reaction increases. When I repeated my results and experiment the times were similar meaning that I was very accurate with my experiment and judgement. Evaluation I only really encountered one problem which was do the experiment in the amount of time that was given to us and Sodium Thiosulphate ran out during the experiment but that was quickly resolved as borrowed some of my friend who is also doing the experiment.