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For my experiment I am going to attempt to observe the reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

SCIENCE COURSEWORK CHEMISTRY For my experiment I am going to attempt to observe the reaction between sodium thiosulphate and hydrochloric acid. What is the aim of my experiment? The aim of my experiment is to measure the rates of reaction What do we mean by the term 'rate of reaction'? The term rate of reaction means the amount of product and the time it reacts in. So the amount of product formed divided by the time taken. In our experiment we cant find out the amount of sulphur that is created in the time. However the amount of sulphur made is constant so the rate is proportional to one over time. I use the formula Rate= K K= constant Time This graph demonstrates the formula of one over time Things that might affect the reaction? Temperature will affect the reaction as the higher the temperature the more the particles will move around. Which in turn means the more the particles will collide with each other. I am choosing to investigate the affect of concentration of sodium thiosulphate on the rate of the reaction. ...read more.

Middle

I will record the room temperature 3. I will measure the amount of hydrochloric acid and the amount of sodium thiosulphate solution require. Using a measuring beaker to measure the volume. 4. I will place a white sheet of paper marked with a cross such a 'X'. The I place the the sheet underneath the conical flask. 5. I will mix the two solutions in the conical flask 6. I will start the stop watch 7. After I have witnessed a reaction I will note my results on a results table 8. I may alter the experiment by changing the amounts of either base solution (water) or even changing the amount of Hydrochloric acid. This may improve and make clearer results I hope to get in the main experiment which are in my prediction. We took the room temperature before the experiment which was 22 degrees Now I will do my Preliminary experiment Hydrochloric acid Sodium Thiosulphate Water (H20) Results in seconds 10cm2 0 10cm2 59.30s 10cm2 2cm2 8cm2 41.50s 10cm2 4cm2 6cm2 33.20s 10cm2 6cm2 4cm2 22.00s 10cm2 8cm2 2cm2 16.20s 10cm2 10cm2 0 13.10s Conclusion In my experiment I found that during the reaction between Hydrochloric acid and Sodium Thiosulphate, when the Hydrochloric acid is added to sodium Thiosulphate solution, a fine deposit of sulphur is formed. ...read more.

Conclusion

As more and more sulphur is formed, the solution becomes more and more cloudy. Soon it becomes impossible to see through the solution. From my one over time graph I have found my results take up a similar structure. Evaluation My results were of a particularly accurate standard as I did each concentration the reaction was taking place twice and calculated an average from these times. There were no strange results within my results table and I think that this was because of the extreme caution and care that I put into making sure that the experiment was set up correctly with careful measuring of chemicals. Things I could of changed were the heat I could of changed the heat which would of set up a further experiment. Overall I am pleased with my experiment. Adaptations to this experiment could be made I believed the results weren't totally accurate as the human eye isn't totally trust worthy as a judge. Maybe in future experiments a machine featuring a light beam could be used instead of the traditional 'X' and when the beam is broken it automatically stops a build in stop watch. Simon Law Dr Brazier GCSE Chemistry Coursework January 2003 ...read more.

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