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How the temperature would affect the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Aim: How the temperature would affect the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. Sodium + Hydrochloric Sodium + Sulphur + Sulphur + Water Thiosulphate Acid Chloride Dioxide (Precipitate) Na2SO2O3(aq) + 2HCL(aq) 2NaCL(aq)+ SO2(g) + S(s) + H2O(l) I will use how quickly it takes for me not to see a cross under the conical flask of this reaction. Prediction: I predict that as the temperature is increased the rate of reaction will increase. This means if I plot a graph of time against temperature my graph will have a negative correlation and will be curved as the increase in rate of reaction will not be exactly the same as the temperature is increased. This can be justified by relating to the collision theory. When the temperature is increased the particles will have more energy and will move faster. Therefore they will collide more often and with more energy. 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 small particles with enough energy to overcome the barrier will react after colliding. The minimum energy that a particle must have to overcome the barrier is called the activation energy. The size of this activation energy is different for different reaction. ...read more.

Middle

This will make sure that the test is as fair as possible. Apparatus: * Hydrochloric Acid * Sodium Thiosulphate * 1 thermometer * 2 measuring cylinders * 1 beaker * I conical flask * 1 tripod * 1 gauze Water Bath * 1 heatproof mat * 1 Bunsen burner * Stopwatch * White card with a black 'X' on it * 1 pair of tongs * 1 pair of goggles * 1 Lab Coat Method: 1. Put on Safety Goggles and Lab Coat. 2. Set up water bath as shown in the diagram. 3. Use a measuring cylinder to measure 5cm� of Hydrochloric Acid and 5cm� of Sodium Thiosulphate into two separate test tubes and place them into the water bath to get them to the desired temperature with the use of a thermometer. 4. Put conical flask on the centre of white card with the cross on it. 5. Empty reactants from test tube into the conical flask simultaneously and start timer immediately and observe the black cross. 6. Stop timer as soon as black cross on the white card under the reaction vessel (conical flask) is no longer visible. 7. Record results on the results table. 8. Wash out test tubes and conical flask with clean water and repeat test at the same temperature two more times. ...read more.

Conclusion

I could also improve my experiment by using a pipette to measure the volumes more accurately. If I could find a way of preventing this unfair loss of heat from the flask as well as the use of a pipette I could get even much better results. My procedure was good and easy to follow and this is shown in my results. However, I did not use an instrument to fine out whether I could see the cross or not so I could not record a number value for this. My eye could have detected this not to the same accuracy and precision. I could improve on my experiment by using a light meter instead of my eye to detect the end point of the reaction. Or I could have done an experiment which releases a gas given off to measure the rate of reaction, although my results were not so precise (close together). I took 3 readings and calculated the average in order to reduce the level of error. The quality of my results were good. It would have been good to have done more repeats. Two teats were managed each time but if one had been wrong this could have dramatically changed the average time and therefore the rate of reaction. All in all I think this was a successful experiment and the best that could have been done with the time and resources available. The results supported my predictions and they seem to be fairly reliable results. ...read more.

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