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Investigate the affect of temperature of sodium thiosulfate and hydrochloric acid against rates of reaction.

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Introduction

Affect of Temperature Preliminary Experiment For my first preliminary experiment, I had to investigate the affect of temperature of sodium thiosulfate and hydrochloric acid against rates of reaction. The chemical equation for this is: Sodium thiosulfate + hydrochloric acid sodium chloride + sulfur dioxide + sulfur + water Na2S2O3(aq) + HCL(aq) NaCl(aq) + SO2(aq) + S(s) + H2O(l) The solid sulfur (S(s)) formed in this reaction makes the colourless solution go cloudy. I used my preliminary results to give myself an idea of which temperature would give me the best results. For my preliminary results, I used 30 cm� of sodium thiosulfate solution, 5 cm� of Hydrochloric acid and 20 cm� of distilled water. The variable that was changed was the temperatures. My preliminary results are in the table below: Temperature (�C) Time (seconds) 1 / time (s��) 1 / time (s��) x 100 22 61 0.016 1.6 36 24 0.042 4.2 38 20 0.05 5 39 25 0.04 4 46 17 0.5882 58.82 49 17 0.5882 58.82 54 9 0.0185 1.85 71 6 0.1667 16.67 From the table above, I can see that the 71�c temperature produced the best results, because this temperature gave me the quickest reaction time. ...read more.

Middle

This should reduce the mistakes in my preliminary experiment because I have chosen a more Apparatus Used * 3 beakers * Tripod * Gauze * Bunsen burner * Mat * Conical flask * Thermometer * A4 paper * Stopwatch The Method * Get 40 cm� of sodium thiosulfate solution, 30 cm� of distilled water and 10 cm� of hydrochloric acid (HCL). * Put each solution into a different beaker and label them. * Get the tripod, place the gauze on top of it, and then place the Bunsen burner underneath it. Place the Bunsen burner on top of the fireproof mat. * Put the water and thiosulfate solution into a conical flask and heat to a chosen temperature. Keep the acid away from the Bunsen burner, as this could start a fire. Choose a temperature by using a thermometer. Make sure you wear goggles, as this is a safety issue. * While your partner watches the temperature and gets it to the chosen one, you draw a circle (the same width as the conical flask) ...read more.

Conclusion

x 100 25 48 0.02 2 35 31 0.03 3 45 20 0.05 5 55 12 0.08 8 65 7 0.14 14 75 3 0.33 33 From my table below, I can see that the 75�c temperature produced the best results, because this temperature gave me the quickest reaction time and therefore, this means that 75�c test is the highest temperature that I can go up to before the sodium thiosulfate solution begins to decompose. Once the solution began to decompose, it was too difficult to measure the time it took for the solution to turn cloudy because the reaction was too quick for me to measure. My Graph From my graph, I can say that there is an exponential relationship between the temperature and reaction rate, in the sense that for every 10�c rise in temperature, there is an increase in the reaction rate by about 60%. My Conclusion From my experiment, I can say that as the temperature of the sodium thiosulfate solution increased in both experiments, the time taken for the reactions to complete decreased. The rate of increase appeared to be 60% faster for every 10�c rise in temperature, although I expected the rate of reaction to double. ?? ?? ?? ?? ...read more.

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