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Sodium Thiosulphate and Hydrochloric Acid Reaction

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Introduction

Sodium Thiosulphate and Hydrochloric Acid Reaction Plan For Sodium Thiosulphate and Hydrochloric acid to react their particles need to collide with sufficient energy. There are three ways I can speed up the reaction, these are: * Increasing the temperature, this causes the particles to move faster, there for the particles collide move often and with sufficient energy, so the particles react. * Adjusting the concentration; to alter the concentration of the hydrochloric acid water is substituted for acid. This makes the acid weak and so you start with weak acid and gradually add acid to it, making it stronger. * A Catalyst; a catalyst works by giving the reacting particles a surface to stick to where they can bump into each other more often which increases the collisions and speeds up the reaction. In my experiment to speed up the reaction between Sodium Thiosulphate and Hydrochloric acid, I am going to increase the temperature until I can see the rate of reaction go up. I have decided to use the temperature increase because it can be easily controlled and readings can be taken simply. ...read more.

Middle

* I will only ever change the temperature. * Using the same printed paper * Start the clock as soon as the acid is poured into the flask Predictions I predict that the higher the temperature the faster the solution will react so for example when the solution is at 30�C it will take 20 seconds for the solutions to react, and when the solution is at 40�C it will take 10 seconds for the solutions to react. I predict this because I know that when a solution is at a high temperature it's particles move faster causing the solution to react quicker. Analysis On my results when the temperature is at 22�C the two solutions take 39 seconds to react and make the solution cloudy. This shows that the higher the temperature the faster the chemicals react. This rise in temperature causes the two solutions to react quicker because; reactions only happen if the particles collide with sufficient energy. At a high temperature there will be more particles colliding with enough energy to make the reaction happen. ...read more.

Conclusion

in a hot room temperature the solution would take longer to cool down, than if it was in a cool room temperature. So I need to make sure the room temperature is the same for every experiment. * Amount of Sodium Thiosulphate/Hydrochloric acid ~ There may have been inaccurate measurements of the solutions, so this wouldn't of been a fair test. If there was more acid the reaction would of happened quicker. I could use burettes or pipettes to measure more accurately, and get the same amount for each experiment. * Time ~ The time between heating the solution and pouring it in to the flask, and starting the time maybe different for each experiment, thus making it an unfair test. To overcome this problem, I could have made sure the room temperature was the same at every reading, also I could have had a set time between removing the Bunsen, and starting the timer e.g. 5 seconds. Overall the experiment I did proved that increasing the temperature speeds up reactions. I have learnt to be more accurate with experiments and plan them out carefully thinking about every aspect. Laura Curnock 11SKs 28/04/2007 ...read more.

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