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Investigating reaction rates of Sodium Thiosulphate and Hydrochloric acid

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Introduction

Sandeep Brar 10D2 Investigating reaction rates of Sodium Thiosulphate and Hydrochloric acid Aim: To investigate the rate of reaction of Sodium Thiosulphate and Hydrochloric acid. In this investigation I will be varying the concentration of Sodium Thiosulphate only and not the Hydrochloric acid concentration. In this investigation I will use the following word equation: Sodium Thiosulphate + Hydrochloric acid In this investigation I will use the following symbol equation: Na2S2O3 + Hcl Prediction: I predict that as the Sodium Thiosulphate concentration increases the rate of reaction will also increase. The reason I predict this is because there will be a higher concentration of particles and so a faster reaction would be able to occur- so the reaction rate would increase. There will be more particles of Sodium Thiosulphate and Hydrochloric acid in a small volume and so more collisions are likely to occur which in turn cause a quicker rate of reaction. In this investigation I used 25cm cubed of Sodium Thiosulphate and 5cm cubed of Hydrochloric acid. Health and Safety: In order to make this investigation as safe as possible for myself I took a number of precautions. The first precaution that I took was to wear a lab coat and goggles. ...read more.

Middle

Sandeep Brar 10D2 This diagram shows a Hydrochloric acid particle and Sodium Thiosulphate particles colliding with one another. So if there is a collision between the reactant particles then it is likely that a reaction will soon follow between the two reactants. Apparatus: * Sodium Thiosulphate (varying concentrations) * Hydrochloric acid * measuring cylinder * beaker * Stopwatch * glass rod * Test Tube * Black marker- to mark cross on measuring cylinder * Goggles * Lab coat * 100ml water * Burette * Thermometer * Pipette *In this investigation I used a burette instead of a conical flask because I think a burette is more accurate than a conical flask. Method: * Collect all the apparatus listed in the apparatus list above. * Set up all the apparatus as shown in the diagram below. * Put on all protective clothing required-goggles and lab coat. * Draw a medium sized black dot with a black marker on the test tube. * Pour a 100ml of water into the beaker. * Pour any concentration of Sodium Thiosulphate into the measuring cylinder. * Pour 5ml Hydrochloric acid into the test tube. * Carefully put the test tube containing Hydrochloric acid into the beaker and check that the black dot is not facing you. The black dot should be facing away from you. ...read more.

Conclusion

This was partly due to my own research and the collision theory which states that reactant paticles collide with one another to cause the substances to react. If I had another chance to carry out this investigation in a different way I would change a number of things. Firstly I would use different amounts and concentrations of both Hydrochloric acid and Sodium Thiosulphate. I would also change the colour of the cross on the boiling tube to observe what affect that has on the results of the investigation. I would also change the volume of the Hydrochloric acid that can be reacted with the Sodium Thiosulphate. I would change these things in order to compare the results between the two different investigations and also to observe what difference different concentrations make on both investigations. If I had obtained any anomalous results I would have repeated those concentrations of Sodium Thiosulphate to find out why those results were anomalous. If could have repeated the investigation the exact same way once or twice more to make sure my results are correct by comparing all the different results that I would have got. I also could have used a wider range of concentrations of Sodium Thiosulphate in order to help me prove that my prediction was correct and also to check that the results were same to what I had already obtained. ...read more.

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