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Investigating the effect of changing temperature on the rate of reaction between sodium thiosulphate (Na2S2O3) and hydrochloric acid (HCL).

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Introduction

Investigating the effect of changing temperature on the rate of reaction between sodium thiosulphate (Na2S2O3) and hydrochloric acid (HCL). Plan - Apparatus * Thermometer * Bunsen burner * Water (H2O) * Sodium thiosulohate (Na2S2O3) * Hydrochloric acid (HCL) * Stopwatch * Measuring cylinders * Measuring beaker * Paper Prediction In this investigation I predict that my results table will look like this - This shows that as the temperature increases, the rate of reaction increases. I think this will happen because heating a substance has an effect on the rate it reacts by making the particles move faster and collide more vigorously with each other and therefore produce more effective collisions per second, causing a faster rate of reaction. Factors to Control The factors that I will need to control are keeping the same amount of chemicals used each time, washing out the apparatus after each test in case there is something left that will effect the next reaction. Also I will keep the same size apparatus each time and the same cross. Method * Start by setting out the equipment in the right places for you. ...read more.

Middle

I chose these measurements because the reaction was quicker then using a more dilute mixture. This is because, as the concentration increases, the particles are closer together so the collision frequency increases and there are more particles reacting per second. Results - Temperature of Mixture (�c) Time Taken for Cross to disappear (s) Rate Measure (1000/time) (sec -1) 40 21.87 46 40 14.97 67 40 17.94 56 50 12.28 81 60 5.43 184 70 3.19 313 80 2.28 439 80 1.97 508 Conclusion - My graph shows that as the temperature increases, the rate of reaction increases. Also, as the temperatures get higher the rate increases more and more. You can tell this from the line of best fit on the graph getting steeper as the temperature goes up. The reason this happens is the same as I predicted. It's because if you increase the temperature, the particles move faster. As they are moving faster, there are more collisions in a certain time and are more vigorous to react. This makes the rate of reaction increase as more heat energy is exposed to it. ...read more.

Conclusion

Also using more accurate apparatus could have made my results more reliable. Such as a digital thermometer that gives you an exact temperature. Results Evaluation - All my results show a clear pattern. The temperature increases as the rate of reaction increases. All my points are quite close to the line of best fit. All my points are good enough to male me feel confident bout the line of best fit and support my conclusion well. As the rates increased, the reliability of my results declined. This is because on the graph I made the line of best fit gets steeper and as the rates get faster a small mistake could make a big difference in the result. These may course any anomalies. The only bad results I had was on the first temperature (40�c) where I had to repeat it two more times because the first repeat had a big difference to the original. This was just a human error on my part as I wasn't paying my full attention when I first got started. ?? ?? ?? ?? ...read more.

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