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The Rates of Reaction Between HCl and Na2S2O3.

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Introduction

The Rates of Reaction Between HCl and Na2S2O3 Introduction This is an experiment to explore the rate of reaction when HCl (Hydrochloric Acid) reacts with Na2S2O3 (Sodium Thiosulphate). Also to find the rates of reaction I am going to dilute the HCl to test the particle collision theory. Equipment List Safety Glasses A pipette A conical flask 2 x measuring cylinders Bottle of Na2S2O3 Bottle of HCl Stop clock Piece of white paper with black cross Safety To ensure safety in this experiment I follow these rules: Always wear safety glasses Stand at all times Report any spills imediately Follow basic lab safety rules Work tidily Be sensible with equipment Method This experiment is not a hard one to set up or carry out. Firstly, I will place the conical glass on the piece of paper, making sure that the glass is clean so I can see the cross clearly to start with. Then I will measure out 25cm� of Na2S2O3 using one of the measuring cylinders. I will then pour it into the conical flask, making sure not spill any as I do it. ...read more.

Middle

Also, temperature will be a factor, I will have to try to do the experiment in the same temperature, but unfortunately i cannot control this so it may affect my experiment slightly. Prediction The particle collision theory tells us that the higher the concentraion the greater the chance of the reaction occouring. When the water is added, it decreases the concentration, so it greatly decreases the chance of the sodium thiosulphate molecules coliding with the hydrochloric acid molecules. In contrast to this, when there is less water, there are more molecules to collide so there is a greater chance of the mollecules coliding in the right orientation, so they bond, this means the reaction will happen faster. This leads me to predict that as I increase the concentration of Hydrochloric acid increases the time it takes for the solution to fully react will decrease, so the rate of reaction will increase. Results Analysis As the concentration of the acid increases, the average time it takes for the reaction to take place decreases, so the rates are increasing. My results and graph both show that my prediction was correct, however I think that the whole of the second set of results are anomalous. ...read more.

Conclusion

A colorimeter measures the intensity of light that travels through the solution. This would be better than using the cross, because you could just stop once you reach a certain intenstiy. I think that my results are vaild and that my experiment was fair. The set of results one and three are very similar and this shows my results are valid. My investigation was fair, the only thing that affected the experiment was the temperature, which I have no power over. I could have perhaps carried out this experiment more times but I know that it would have just showed the same as what my results already show me. It would have been better though for my conclusion had I done a couple of more experiments because I would have been able to analyse my results more. Also, if I was doing an investigation on the particle collision theory and not reaction rates, then I could have used all the variables, in different experiments, that I have stated throughout this investigation. Overall, I think that this investigation went really well as I had no real difficulties, apart from stopping the stop clock on time. I believe that this experiment is suitable and could be used by anyone to test the rates of reaction for HCl and Na2S2O3. ...read more.

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