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Investigation into how temperature affects the rate of reaction between SodiumThiosulphate and Hydrochloric Acid.

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Introduction

Chemistry Coursework - Investigation into how temperature affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid AIM The aim of this assignment is to investigate how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid. BACKGROUND MATERIAL To enable me to write a suitable prediction and be able to conduct a reliable and fair experiment I had to carryout background research into rates of reactions and the collision theory. The first piece of information I researched into was rates of reaction. Rate of reaction means how quickly a reaction takes place and depends on how many successful collisions there are in a given unit of time. There are many factors that affect the rate of reaction. In my assignment I will be focusing on the results of temperature increase. Through my research and previous work I have found that an increase of temperature gives molecules more kinetic energy therefore causing them to move fast and more vigorously. This will cause there to be a greater chance of successful collisions between the sodium thiosulphate and hydrochloric acid molecules, thus increasing the rate if reaction. If the molecules do not have enough energy when they collide they will rebound. An increase in temperature will give the particles enough energy to successfully collide and react. This will therefore increase the rate of reaction. Also through my research I have found that an increase of temperature by 10�C should approximately double the rate of the reaction, in my assignment I will be looking for evidence of this. ...read more.

Middle

Movement of conical flask -must not be moved Do not use catalyst Volume of the sodium thiosulphate and hydrochloric acid solution In my experiment I must change the temperature to allow me to see how the varying temperature affects the rate of reaction. To do this I will have to time how long it takes until the cross is no longer visible which shows how long it has taken the sodium thiosulphate and hydrochloric acid to react. To allow me to gain fair results, only influenced by temperature I must control several variables. The concentration must be kept constant as it affects the rate (see background material for details). Also I must not move the conical flask, this is because it can also affect the rate of reaction (see background material for details). Another variable I must control is not to use a catalyst. This is due to catalyst speeding up reactions (see background material for details). Also I must control the volume of the sodium thiosulphate and hydrochloric acid solution. This is because by increasing the volume of the solution there would be more particles, therefore increasing the chance of collisions, thus increasing the rate of reaction. Safety Instructions Use heatproof mat Wear safety spectacles Carry out experiment standing up Move bags and jackets out of the way Method * Measure 25ml of sodium thiosulphate using a pipette. * Pour sodium thiosulphate from pipette down to the 0ml mark into conical flask (pour the excess into sodium thiosulphate container). ...read more.

Conclusion

Although this happened it did not affect my main experiment as I used the correct method. Although overall I feel my investigation has gone well, there are faults in my experiment and several ways in which I could improve. One problem with my experiment was temperature. When heating the sodium thiosulphate I was unable to get to the required temperature and keep it constant. This was because by using the Bunsen burner it meant the temperature would continue rising after the required temperature had been met and if the sodium thiosulphate had been heated then allowed to rise to the required temperature it would then fall below it. This was a major problem in my experiment therefore causing it to be unreliable in that way. However, although the temperatures were not accurate, for each result there was a higher temperature and in both sets of results there was a similar temperature used therefore still showing that increasing the temperature causes the rate of reaction to increase. Another way I could improve experiment would be to take more readings and repeat them more than twice. This would make it more accurate and show the trend over more temperatures. Also although I did find that an increase of 10�C does approximately double the reaction time I could only see this between to results. This was due to me increase the temperature every 15�C, if I was to redo the experiment I would increase the temperature by 10�C or if I had a more precise method I would increase the temperature every 5�C. ...read more.

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