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Investigating the effect temperature has on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Investigating the effect temperature has on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Introduction In this experiment I am going to investigate the effect that temperature has on the rate of reaction between sodium thiosulphate and hydrochloric acid The equation for the reaction is: Sodium + Hydrochloric Sodium + Sulphur +Sulphur + water Thiosulphate Acid Chloride Dioxide Na2S203 (aq) + 2HCL (aq) NaCl(s)+S2(s)+S02 (g)+H20 (l). Prediction I predict that the temperature would affect the rate of reaction; the higher the temperature, the faster the chemical reaction would take place and as a result there would be a more rapid drop in the light level. The reason for this being is because at high temperatures molecules are supplied with more thermal energy, which is converted to kinetic energy, and so collisions are greater therefore speeding up the reaction process. Apparatus The apparatus that I will be using are: � Conical flask � Stop - clock � Measuring Cylinder � Thermometer � Goggle � Light sensor � Clay pipe triangle � Clamp � Water baths Method 1) ...read more.

Middle

� Making, sure that coats and bags are all out of the way while doing the experiment. Results The results of my table are shown below: Temperature-13?C- cold TIME (S) LIGHT LEVEL IN LUX 1 2 3 AVERAGE 0 2.13 2.18 2.18 2.16 30 2.14 2.12 2.11 2.12 60 2.02 2.02 2.01 2.01 90 1.93 1.95 1.98 1.92 120 1.84 1.80 1.82 1.82 24?C -Room Temperature TIME (S) LIGHT LEVEL IN LUX 1 2 3 AVERAGE 0 2.16 2.10 2.14 2.13 30 1.91 1.95 2.03 1.96 60 1.79 1.79 1.87 1.81 90 1.72 1.74 1.81 1.75 120 1.68 1.70 1.75 1.71 Temperature-30?C TIME (S) LIGHT LEVEL IN LUX 1 2 3 AVERAGE 0 2.17 2.20 1.99 2.12 30 1.80 1.97 1.57 1.78 60 1.66 1.82 1.46 1.64 90 1.60 1.79 1.24 1.54 120 1.66 1.77 1.29 1.57 Temperature-40?C TIME (S) LIGHT LEVEL IN LUX 1 2 3 AVERAGE 0 2.08 2.08 2.11 2.09 30 1.93 1.84 1.75 1.84 60 1.77 1.75 1.65 1.72 90 1.78 1.73 1.60 1.70 120 1.78 1.73 1.60 1.70 Temperature-55?C TIME (S) LIGHT LEVEL IN LUX 1 2 3 AVERAGE 0 2.14 2.04 2.09 2.10 30 1.68 1.62 1.67 1.66 60 1.64 1.60 1.60 ...read more.

Conclusion

All the other lines are curves. The 55?C is the steepest (and so it is the fastest reaction). The next fastest reaction is 30?C then 40?C and then 24?C. The lines don't end at the same light level although this is what you would expect. Evaluation I think that most of the experiment I have done has been fine, with as little anomalous results as possible. However, there are still a few anomalous results. They are ringed on the graph. The result may have turned out anomalous because of basic human error, or maybe because we measured the substances wrong. It may have even been because we did not clean the apparatus properly. Apart from this, the accuracy of my experiment has been more or less accurate. Although there are a number of ways in which we could have made the results more reliable. For instance, we could have used better measuring equipment, because the apparatus we used was mainly basic equipment. Another thing we could have done to bring more evidence is to have tried to use the hydrochloric acid as the variable substance, and used the sodium thiosulphate as the constant substance. This would have brought more evidence to support the idea that the higher concentration of a substance, the faster it will react. 1 ...read more.

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