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The aim of this experiment is to find out how temperature affects the rate of reaction between Sodium thiosulphate and hydrochloric acid.

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Introduction

Obtaining Evidence Time (sec) for reaction to take place Temperature of Sodium thiosulphate Rep1 Rep2 Rep3 Rep4 10 254 260 257 263 20 133 136 127 130 30 74 68 71 77 40 34 40 37 43 50 22 20 20 18 60 11 10 7 9 70 8 7 7 6 80 4 4 4 5 90 3 3 4 4 100 3 2 3 2 Plan Aim of experiment The aim of this experiment is to find out how temperature affects the rate of reaction between Sodium thiosulphate and hydrochloric acid. Prediction I predict that every time the temperature increases by 10 degrees the rate of reaction will double. I also predict that the rate of reaction will increase dramatically, because rate of reaction increases when you increase the concentration of one of the reactants and rate of reaction also increases when you increase temperature. When temperature increases so should the rate of reaction, the equation for this is - Nas2O3(aq)+2Hc1(aq) ...read more.

Middle

When you increase the pressure the molecules have less space to move around. That greater concentration makes them collide with each other more often. Safety * Always wear goggles to protect your eyes from the acid * Never heat the Hydrochloric acid because heating acid can be very dangerous * Always wear gloves to protect your skin from the acid Fair test Concentration of the acid etc. affects the rate of reaction so to make sure it is a fair test I will keep all the factors the same. The only thing that won't be staying the same is the temperature. Ranges I will use temperatures ranged between 10-100, going up in tens. So altogether I will have 10 different temperatures. Replication I will repeat the experiment at least 4 times and any results that are obvious anomalies will be repeated straight away. Obvious anomalies are results that are more than 3 seconds apart. Apparatus * Measuring cylinder (at least 25ml) ...read more.

Conclusion

Pre test results Time (sec) for reaction to take place Temperature of Sodium thiosulphate Rep1 Rep2 Rep3 Rep4 10 301 302 300 299 21 157 155 154 166 38 31 30 28 28 60 9 10 10 12 71 7 6 7 6 Analysis Increasing the concentration increased the rate of reaction. It was directly Proportional. Also increasing temperature increased the rate of reaction. The results were a lot like my pre test results and my prediction. Evaluation Very accurate apparatus was used. There was very little chance of human Error. My results are accurate because they are no more than 3 seconds apart At each repetition. Accuracy was increased by doing repetitions and will Reduce impact of anomalies. Possible improvements I could put a light sensor under the beaker that would overcome errors by human judgement. As soon as it reaches the desired point of cloudiness the underneath of the beaker will become dark. This will trigger it and log the time. Future studies My prediction of how concentration will affect rate of reaction is that as we increase concentration, the rate of reaction increases ...read more.

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