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The effect of temperature upon the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.

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Introduction

The effect of temperature upon the rate of reaction between Sodium Thiosulphate and Hydrochloric acid Plan I am going to be measuring the effect of temperature upon the rate of reaction between Sodium Thiosulphate and Hydrochloric acid. A yellow precipitate is produced in the reaction between the two chemicals in question. Na S O (aq) 2HCl(aq) 2NaCl(aq) S(s) SO (g) H O The rate of reaction can be seen by recording the time taken for a given amount of sulphur to be precipitated. I will do this by placing a conical flask containing the reaction mixture onto a cross on a piece of paper. As the precipitate of sulphur forms, the cross is obscured and finally disappears from view. The time taken for this to happen is a measure of the rate of reaction. To get enough information on the effect of changing the temperature of the reactants, several experiments must be done, using different temperatures of hydrochloric acid. To make this method safe I will be wearing goggles at all times to protect my eyes and I will thoroughly wash all my equipment with distilled water between each experiment to make it a fair test. ...read more.

Middle

I will also be using a 100ml beaker for heating the chemicals in question and to heat it I will use a Bunsen burner, with a hating mat, tripod and gauze. A piece of paper will also be used for the cross underneath the reaction. Procedure Firstly I will measure out 50ml of Sodium Thiosulphate and 5ml of Hydrochloric acid using different measuring tubes. I will then put the Sodium Thiosulphate in the beaker and the Hydrochloric acid in the conical flask. The Sodium Thiosulphate will then be heated to the specific temperature and poured into the conical flask with the Hydrochloric acid, which will be sat upon the piece of paper with the cross on it. As soon as the Sodium Thiosulphate has been poured I will start the timer and stop it when the cross is no longer visible. This method will be repeated with each different temperature. Results Temperature of HCl Time taken for cross to disappear (s) (1st result) Time taken for cross to disappear (s) (2nd result) Average(s) 20 27.00 25.19 26.10 30 10.98 18.16 14.57 40 8.91 8.75 8.83 50 6.97 7.09 7.03 60 4.41 4.97 4.69 I have taken two sets of readings and calculated the average to get more accurate results. ...read more.

Conclusion

I have also measured the results to 1/100 of second, which makes them more accurate. I only had one anomalous result at 50�c, which does not quite follow the line of best fit that probably occurred due to human error. Also for the readings at 30�c I had two results that were very far apart compared to the other results but the average evened out and fits with the rest of the results. I think that both the results were out in either direction but evened out in the average. Other than these anomalies my results were accurate and the gap between them were all under 1 second. I think my results were fairly reliable. Modifications that I would do next time would be to use a normal beaker to contain my reaction as then I could look down onto the reaction and my vision wouldn't be blurred by the glass of the flask. I would also use a machine to constantly shake the flasks as then it would not be unfairly done and all the reactions would get equal shaking. I would also use heating apparatus to remove the problems, which I stated earlier. I think the range of results I used was sufficient but if I wanted to get more accurate findings then I could measure to every 5�c rather than 10�c and take another set of readings to get a more accurate average. ...read more.

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