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Experiment: Can Temperature Change the Reaction Time of Something?

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TIMING REACTION SPEEDS EXPERIMENT: CAN TEMPERATURE CHANGE THE REACTION TIME OF SOMETHING? PLANNING INTRODUCTION; I am going to investigate the effect of varying the concentration of Sodium Thiosulphate in a reaction with Hydrochloric Acid. I already know that when I combine these two substances they will become misty and cloudy. I am going to do the experiment in different temperatures and see if the reaction speed changes. To know when the experiment is finished I will draw a cross under the glass conical and wait until is has disappeared. I have chosen this reaction because it has a definite end point, when the cross on the paper disappears. SAFETY AND FAIRNESS: I will make sure the test is fair by using the same amount of hydrochloric acid and thiosulphate in each experiment, and by using the same sized equipment, if not the same. I will also use the same cross and glass conical and make sure that the hydrochloric acid is at the same temperature each experiment. PREDICTION: I think that when the temperature of the reaction is higher then I think that the reaction will take place faster. EQUIPMENT LIST: For this experiment I will need a list of certain equipment: A glass conical (to contain the reaction fluids), A bottle of hydrochloric acid (50 ml), A bottle of thiosulphate (50 ml), A Bunsen burner (to change to temperatures), A tripod (to ...read more.


- Stirring the mixture - The concentration of each substance PREDICTION: I think that when the Bunsen flame is more violent and therefore the temperature is higher then the reaction will take place much faster. This is because the particles reacting will have more energy because of the heat and therefore will bump into each other more. When the temperature isn't so great then the particles of thiosulphate and hydrochloric acid will not have so much energy and so will therefore bump into each other less. MEASUREMENTS: In this experiment I shall be taking five tests at different temperatures but will then do the test for each temperature three times and take the average. EXTRA KNOWLEDGE: What is the most accurate way of obtaining the reaction rate between sodium thiosulphate and hydrochloric acid? Reaction, over a certain time, is equal to the change in concentration of the reactant or the product divided by the time taken. Which method you use depends on the type of reaction it is. One way of finding this out is by carrying the reaction out in a thermostatically controlled bath - i.e. one that you can control the temperature of. A sample of the reacting mixture is withdrawn with a pipette and the reaction within this bit of the mixture is stopped. ...read more.


EVALUATION: I think that the results were fairly accurate though the test were definitely as fair as they could get, there are a few things that could make the results a little more accurate. These things are the fact that you are using your eyes to determine when the test is finished. To over come this you could use a light sensory kit that would stop the experiment at a certain point when the cross disappears. Another thing wrong with the experiment is that it is extremely hard to get the temperature just right and then to keep the temperature the same whilst the reaction is taking place is impossible. There is one way you could possible get around this, you could use something like a water bath that could keep the temperature of the reaction the same until it has finished. The method of the experiment wasn't bad and it worked so I guess it was quite good. In the experiment there was one thing I had to change though and that was to add more of each of the substances, Thiosulphate and Hydrochloric Acid, to the reaction as the experiment wasn't taking place fast enough. Otherwise I would have been stood there for hours and I also would have been hard to see a reaction taking place as the cross disappears. Other than these factors then we could say that the experiment went successfully and I received some quite accurate results. MARK GLENISTER 10D 30/04/07 ...read more.

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