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Investigating How Temperature Affects the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

INVESTIGATING HOW TEMPERATURE AFFECTS THE RATE OF REACTION BETWEEN SODIUM THIOSULPHATE AND HYDROCHLORIC ACID Aim: The aim of this experiment is to investigate how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Theory: Through the knowledge which I have attained through previous experiments exploring how collisions between particles vary with different temperatures, I have come to the theory that the rate of reaction between sodium thiosulphate and hydrochloric acid will increases with heat. When temperature is increased, particles move faster and this leads to more successful collisions. When the number of successful collisions is higher, the rate of reaction is faster. Fig. 1: Fig. 2: Figure 1 shows a reaction at a low temperature. The particles are moving slowly so there are not very much successful collisions. Figure 2 shows a reaction at a higher temperature. There are more successful collisions because the particles are moving faster. The balanced equation for the reaction between sodium thiosulphate and hydrochloric acid is: Na2S2O3 + 2HCl ? 2NaCl + SO2 + S + H2O Temperature has a large effect on the rate of reaction. The higher the temperature is, the faster the reaction, which also means the faster the solution will turn cloudy. ...read more.

Middle

I could see that 90?C was too high for this experiment because the solution would turn cloudy almost instantly. This would mean that results would not be very accurate because I would not be able to stop the timer in that short amount of time. I also decided to use 20?C as the lowest temperature for my experiment as the reaction was not too slow. Variables and fair testing: There are many aspects to consider when ensuring that the experiment is a fair test. I will have to make sure that all of the flasks and measuring cylinders are clean and dry. They have to be clean because another substance, or even the same, would alter the results and this would give an inaccurate reading. They would have to be dry because if they are slightly wet then the concentration of the solution would be changed. Temperature is a very important factor. In this experiment a Bunsen burner is being used to control the temperature. For a fair test I am going to heat the solution two degrees above the desired temperature as this will allow time to move the conical flask onto the cross. It is vital that the volume and concentration of the solutions and the size of the conical flask are kept the same throughout the experiment. ...read more.

Conclusion

The measuring of the acid could be improved by using a burette instead of a measuring cylinder. A burette would be more precise, so I would be able to obtain more accurate results. I tried my best throughout this experiment to make sure I obtain accurate results. I made sure the equipment I used was in good condition and I tried my best to do very accurate timing, as this was very important. Timing could have been improved. However, inaccuracy of timing was mainly due to human error. My results could have been improved by doing repeats. If I did repeats then I would have been able to obtain an average result, and this would improve the reliability of my results. If this experiment was repeated then I am predicting that the results would be fairly the same-when there is a higher temperature, the reaction will be faster and when there is a lower temperature the reaction will be slower. This is because of the collision theory. To expand my investigation I could see how temperature affects the rate of reaction of a solution at a different concentration. For this experiment I would predict that as the concentration if the solution increases, the rate of reaction would also increase because the ions are much closer together in a concentrated solution which means that more successful collisions would take place. Meera Pithia 11B ...read more.

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