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Rate of Reaction and its effects from Concentration

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Rate of Reaction and its effects from Concentration I am conducting an experiment to show how the rate of a reaction is affected by the concentration. I will use sodium thiosulphate and dilute hydrochloric acid. The result of these two liquids when mixed is a matt white colour, which you cannot see through. I will carry out the experiment by varying the concentration of thiosulphate. I have chosen this because it is the largest quantity of fluid I will be using in the experiment. Changing this element will be more accurate and give a fairer and more accurate experiment. We will test the rate of reaction by timing how long the reaction takes too become so white that we cannot see through it. This will be done by a piece of paper placed underneath the piece of equipment that the experiment is taking place in. ...read more.


Therefore if there is a higher concentration then the reaction will have a shorter duration to react. This analysis has been drawn up from the particle collision theory. With a brief explanation, collision theory is where the molecules in a given area are either moving faster, caused by heat, or a higher concentration of that particular molecule. When one of these two or both elements occur then the molecules are more likely to hit each other, but also they will hit harder. If the molecules hit harder they have a better chance of reacting. Equipment * 6 X Beakers * 2 X Pippets * 2 X Goggles * Paper with black cross * Hydrochloric Acid * Sodium Thiosulphate * 1 X Flask Method 1. Measure 5 different quantities of Sodium Thiosulphate. These are 50 cm3. ...read more.


Water content (cm3) Hydrochloric Acid (cm3) Time to react (sec) 50 0 10 46 40 10 10 65 30 20 10 85 20 30 10 124 10 40 10 313 Clearly here you can see the less sodium thiosulphate there is and the more water content there is in the solution then the time in which it takes to react increases considerably. Evaluate Our investigation was successful and proved a good point. Our experiment could have been conducted more accurately though by using lighting equipment to show when the solutions density fell to a point that only a certain bit of light could be penetrated. This would make the experiment more fair and much more accurate. Our graph displays a gradient that has been evident in other pupil's experiments. Extension Other ways of possibly extending research on collision theory would to do different types of tests. This could be on how temperature affects rate of reaction. However due to time constraints in lesson time we are unable to conduct any further experiments. ...read more.

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