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The aim of this investigation is to see how fast a reaction occurs between sodiumthiosulphate and hydrochloric acid when we change important factors such as concentration of the solution

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Investing reactions between sodiumthiosulphate and hydrochloric acid. Aim The aim of this investigation is to see how fast a reaction occurs between sodiumthiosulphate and hydrochloric acid when we change important factors such as concentration of the solution, the surface area, the temperature and whether or not a catalyst is present. Prediction I predict that the higher the concentration of the fixer (hydrochloric acid) and the lower quantity of distilled water the rate of reaction will be a lot faster. Scientific theory There are certain factors that can affect the speed of reactions. These are temperature (affects the movement/speed of the particles), concentration of the solution and the surface area. These factors are part of the collision theory. The collision theory explains that a chemical reaction can only occur through particles colliding. These particles must collide with enough energy to break the existing bonds. This energy that you need to have is called the activation energy. Out of the four variables I have chosen concentration of the solution as my variable. The other three variables will be kept the same to ensure a fair test. ...read more.


STEPS I'M GOING TO TAKE: 1) Wear goggles 2) Collect equipment and place on my working place 3) Mix thio and water to the correct ratio and then place in reaction beaker. 4) Get 10cm3 of hydrochloric acid and add to reaction beaker 5) Start the stopwatch and stop it when the 'x' cannot be seen. 6) Dispose of chemicals in the waste jar provided. Preliminary experiment. To check if there would be any difference between the high and low concentration of thio and whether the results would happen in a reasonable time I performed a trial experiment to find out. I personally thought that 25ml of water with no thiosulphate would not react and the 25ml of thiosulphate with no water would react very quickly. These were my results for the trial experiment: High concentration (25ml thio~0 ml water)-18.13 seconds Low concentration (20ml water~5ml thio)-165.31 seconds (I didn't use the solution of 25ml water~0 thio because it didn't react) Now I knew this I conducted a more thorough experiment based on these results and compared them to my new results. ...read more.


There is a much higher chance of collision in this solution due to the increase of thio giving the solution more particles to collide. In diagram 3 however I used a higher concentrated 2m acid with no water in it. There was 15 thio particles, 10 water particles and 10 acid particles. There is a good chance of a fast reaction in this solution due to the 10 acid and 15 thio particles, which will have a strong chance of collision. These experiments prove that a higher concentration of acid and thiosulphate will result in a faster reaction. Evaluation I felt that the experiment went fairly good but there are still a lot of points that could be improved on. We had some anomalies during our practical experiment such as the 15ml thiosulphate and 10 ml water. Reasons for this may be the person conducting the experiment forgetting to stir the solution or a miscalculating in the measurements of the two chemicals. The investigation could be improved by making sure all measurements were taken accurately. You could also make sure you stir all of the solution a certain amount of times (so it's a fair test). ...read more.

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