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I am planning to do an experiment to investigate how varying concentration affects the rate of reaction.

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Course Work (1) Rates of Reaction Planning I am planning to do an experiment to investigate how varying concentration affects the rate of reaction. I intend to do this by collecting the following equipment, stop clock, safety goggles, apron, conical flask, paper with a cross on it, thermometer and chemicals sodium thiosulphate and hydrochloric acid. -Then I will wear the safety equipment and measure 50ml of sodium thiosulphate and 5ml of hydrochloric acid (in a different measuring cylinder). -Then I am going to mix the chemicals in a conical flask that is on top of the paper. I will time how long it takes to make the cross disappear. -I will repeat the above steps, 3 times for 5 different concentrations, recording both concentration and time for each one. I think that the higher concentrations will do the reaction more quickly than the lower concentrations. This is because I know that the higher concentrations have got more 'parts' in them to hit together and react. Investigating Rates of Reaction Aim: I am going to do an experiment to investigate how increasing and decreasing concentration differs the rate of reaction when the two chemicals being reacted are sodium thiosulphate and hydrochloric acid. ...read more.


2. Concentration; a higher concentration has more particles in a given volume so they find each other faster so the rate of reaction is increased because more particles collide faster e.g. 3. Surface area: a larger surface area means more particles are exposed to be able to collide and react so this also increases the rate of reaction e.g. 4. Catalysts: provide an alternative or more than one way to produce energy for collisions to happen so a reaction can happen faster. In my experiment I am going to investigate how concentration affects the rate of reaction so I can obtain more results, if I am not investigating temperature because it needs a better lab to control. Prediction: I predict that the higher concentration of sodium thiosulphate in a constant/controlled volume of hydrochloric acid will enable the rate of reaction to increase because I know that in a higher concentration there is more particles in the volume so it is easier for the particles to collide which will increase the rate of reaction. Fair test: To insure that the experiment I carry out is fair each time I shall: * Use the same equipment exactly each time and in the same way * Use the same volume of sodium thiosulphate and hydrochloric acid ...read more.


I can explain or understand how this happened through collision theory because in a higher concentration in a particular volume there is more particles of a particular thing so they collide easier and quicker as there is more of them and they are closer to each other this is what causes the reaction to happen faster when the concentration is increased as the collisions are more powerful and faster. I can prove this with my results. Concentration of SODIUM THIOSULPHATE (molar) Concentration of HYDROCHLORIC ACID (molar) Rate of Reaction (seconds) 0.8 1 7 0.6 1 8 0.4 1 14 0.2 1 19 Evaluation: My results for the above experiment investigating rates of reaction and concentration are quite reliable as the experiment was done in the standard controlled conditions however even though the experiment only investigates the results for the above experiment it also gives a general idea of how increasing concentration increases the rate of reaction through collision theory and the factors of a reaction for any similar experiment. I think I could improve the experiment by bringing other factors of reaction into it and investigating them as a whole how they affect the rate of reaction but for such an experiment more controlled conditions for temperature must be made to make it a fair test. ...read more.

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