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The Effect of Temperature on Rates of Reaction.

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Introduction

The Effect of Temperature on Rates of Reaction Planning the Investigation What do you expect to find out? In my experiment I am trying to find out if changing the temperature of the Sodium Thiosulphate will increase or decrease the rate of reaction (how fast a reaction takes) when mixed with hydrochloric acid. Or how changing the temperature of the Sodium Thiosulphate will affect how long the X took to be no longer visible or how long the solution took to cloud over. What results do you expect to get? I think that the results will be that the higher the temperature of the sodium Thiosulphate the faster the rate of reaction will be. As you increase the temperature of the Sodium Thiosulphate the rate of reaction will be faster when you mix it with the hydrochloric acid (which is at room temperature 20'C) Why do you think you will get this result? I think this will happen because, I can justify this prediction by relating to the "Collision Theory" , when the temperature of the Sodium Thiosulphate is increased, the particles in the Sodium Thiosulphate will have more energy. Particles with more energy are more likely to collide with other particles of the hydrochloric acid. So when the temperature is increased each time thus the particles will move faster and will collide faster with the hydrochloric acid particles when mixed together. So the faster the particles will react the faster the rate of reaction which backs up my prediction. ...read more.

Middle

Thus resulting in an unsuccessful experiment, also if I used 200cm3 of Sodium Thiosulphate this obviously would be an imprudent volume to use. As the rate of reaction would take a long time to react with 10cm3 of Hydrochloric acid maybe would take under a day or maybe more, I do not have this time to do my experiment in as I only have one hour lessons twice a week of Chemistry, so the quantities of the hydrochloric acid and the sodium Thiosulphate had to be sensible. So I had to predict which ones would be most practical to use. Also I decided on testing the rate of reaction on temperature because I thought this would be most practical, as recording my results and plotting them in a graph would be rather difficult, also I have done before a similar experiment on temperature before so I had more confidence in this experiment. I wanted the method of the experiment to be followed in an order, so this would all be organised and so the experiment can flow thoroughly and easily. I decided to do each temperature from the lowest temperature (20 'C) do all three experiments on that temperature as it was room temperature then do the higher ones in order. I decided on this because the temperatures could vary if I do them all in different orders, also they might have to be done on different days and the room temperature can vary from day to day, so I did this in order to collect accurate results. ...read more.

Conclusion

My results do support my original prediction I made at the beginning of the experiment. I predicted that the higher the temperature the faster the rate of reaction. The results support my original prediction because it proves that as the temperature is increased the time taken for the reaction to take place decreases, when we did the experiment the higher the temperature the quicker the reaction took to take place. By looking at the graph you can see there is a definite decrease in the line, it shows negative coloration, Explain what your results tell you using your understanding of science My results show that the collision theory is correct, the results show that the higher the temperature of the Sodium Thiosulphate the faster the rate of reaction will be when it is mixed with the Hydrochloric acid, to back this up I need to look at the collision theory again For a reaction to occur particles have to collide with each other. Only a small percent result in a reaction. This is due to the energy barrier to overcome. Only particles with enough energy will react after colliding. If the frequency of collisions is increased the rate of reaction will increase. However the percent of successful collisions remains the same. So when you increase the temperature of a substance then the particles will move quicker, and when it is mixed with the acid the particles will react, so the quicker the particles are moving the more collisions will be successful resulting in a faster reaction. By Claire Nolan ...read more.

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