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This experiment will show how the temperature and concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

This experiment will show how the temperature and concentration affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Prediction I predict that the higher the concentration of sodium thyosulphate and hydrochloric acid the quicker the reaction. The higher the temperature also has a direct link to the speed of the reaction the higher the temperature the quicker the reaction. Scientific Explanation I believe my prediction to be correct because the collision theory states that the more molecules there are in a solution the greater the possibility of two reacting molecules colliding and forming a new substance. For example if I have placed 4 molecules of sodium thiosulphate 4 molecules of hydrochloric acid and only 2 molecules of water there is a greater possibility of reaction because the majority of the chemicals present can react with one an other. The more diluted the mixture is the longer it takes for a hydrochloric acid molecule to 'find' a sodium thiosulphate molecule. Neither sodium thiosulphate nor hydrochloric acid reacts with water so if they were to collide no reaction would take place. The concentration of each substance stays the same no matter how much of it we use for example if we used 25cm3 of sodium thiosulphate its concentration would remain the same as if we were to use 50cm3. ...read more.

Middle

If I was to wait for this to get to the right temperature then the test tube with the hydrochloric acid in would be too hot. I solved the problem by getting an extra thermometer and extra beaker. Instead of measuring the temperature of the water I would measure the temperature of the test tubes contents. The second beaker I would use to cool the test tube with the hydrochloric acid in while the test tube with the sodium thiosulphate continued to heat. Methord2- Temperature- I have made some modifications to my method this is how it will be carried out now: This is how I will carry out my experiment: * Set up equipment as shown in diagram * Put goggles on * Get 10cm� of hydrochloric in the small measuring cylinder and 10cm� of sodium thiosulphate and 40m� of water in the large measuring cylinder * Put a sticky label around the test tube that will have the hydrochloric acid in always put the hydrochloric in this test tube and the thiosulphate and water solution in the other * Measure the temperature with a 2 thermometers one in each test tube. * Allow the hydrochloric acid to exceed the desired temperature by 10- 15�C * Then take the test tube out and place it into the beaker of cold water while that is cooling down the sodium thiosulphate will be heating up * When you have the ...read more.

Conclusion

The only reasons for these results were such things as human error and miss-judgment for example miss reading the thermometer one person may have had better eye sight than the other he/she was working with meaning on person could still see the cross and the other not. Not washing out the apparatus thoroughly enough. Final reason was I used the temperature of the room on the day I did the concentration reactions and assumed it was the same temperature when I did the temperature reactions. I would like to carry on the experiment and carry on further work with it one of the things I would like to do is another experiment at 30�C I am not sure if any which one of these results is anomalous. I would like to carry out more experiments exceeding 70�C to see weather the rate of reaction continues to rise of weather and some point the line begins to level out. I could carry out more experiments that would enter the graphs on the curve to gain a better and more accurate graph. I could also investigate how pressure can change the rate of reaction does it slow or speed it up, maybe introduce a catalyst to speed up the reaction or even investigate how surface area affects the rate of reaction. By Robert Sanderson ...read more.

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