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Investigating the factors that affect the rate of a reaction.

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Bethan Kelly 11o INTRODUCTION In my investigation I will be investigating the factors that affect the rate of a reaction. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the will increase. However the percent of successful collisions remains the same. An increase in the frequency of collisions can be achieved by increasing the concentration, pressure, or surface area. Things that may affect reactions are variables such as temperature, concentration of the solution and the amount of solution. I will have 60cm of solution. I will start with 50cm of undiluted Sodium Thiosulphate and then add 10cm of hydrochloric acid. And from the exact point the substances are added together I will time how long it takes for the reaction to successfully take place. I will terminate when there is a reaction by placing the conical flask over a piece of paper of which will have a pencilled cross drawn on it and see how long it takes for the solution to become cloudy and enable me to see the cross (This is when I will stop the timer). ...read more.


I predict that as the volume of Sodium Thiosulphate is diluted with pure distilled water the longer it will take for a reaction between Sodium Thiosulphate and hydrochloric acid to take place. EQUIPTMENT In this experiment I will need the following. o Sodium Thiosulphate o Hydrochloric Acid o 3 Conical flasks o Thermometer o 3 measuring cylinders o Water o Glasses o Piece of paper with a pencilled cross o Stopwatch. o Apron FAIR TEST To make my experiment a fair test it is very important that all the way through the experiment the solution is kept at a constant volume at all times. I will be taking the temperature to make sure that it is always around the same temperature as any alterations or changes may make my results unreliable and may also change or affect the rate of the reactions. I will have to ensure that none of the equipment I will be using is contaminated and has all been properly cleaned. I will be using a stopwatch to get a more accurate time of reaction. ...read more.


I predicted that the more the solution was diluted the longer it would take for a reaction to take place. When carrying out the experiment I noticed a pattern forming. At the end of the experiment I could clearly see that all my results were true to my prediction. The time of each reaction increased gradually. This shows the prediction was correct. (The more diluted the solution, the longer it will take for a reaction to take place). EVALUTION I think that my experiment was a success, my prediction and results were clearly correct. I had no "odd results" which enabled me to plot a clear graph with a clear line of best fit. I believe that I kept the right variables the same all the way through e.g. constantly at room temperature. It may of helped me to conduct a pilot experiment to practice recording information and make it easy to no how to handle equipment and monitor the experiment correctly. But I was unable to do that due to illness. I believe that I did my best to keep the test fair and I believe my results to be correct. ...read more.

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