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To investigate how changing the temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Chemistry Coursework: rate of reaction Tom Burgess Aim: To investigate how changing the temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Background information: The rate of reaction is the formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There is five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration, pressure (in gases), surface are, and catalysts. The explanation for a chemical reaction involves the idea of collision. For particles to react they have to collide with enough energy, so not all collisions are successful. To speed up a reaction you must increase the number of collisions and the energy that the collisions have Small surface area: Larger surface area: Formula: Preliminary experiment: In class we did a background investigation where instead of changing the temperature, which is what I am doing in this investigation, we changed the concentration. ...read more.

Middle

After you have done this Measure reactants pour Hydrochloric acid into Measuring Jug and put thermometer in, to get the solutions temperature at room temperature. Then add thiosulphate and immediately start stop clock, stop when the black cross underneath the beaker disappears completely, note the time of the reaction in results table. Wash measuring jug, light Bunsen burner on safe flame, pour in Hydrochloric acid. Put measuring jug onto the tripod and gauge and heat solution with the Bunsen on blue flame use thermometer to get the exact temperature you need. Once on correct temperature add thiosulphate and start stop clock immediately. Stop the watch when the black cross disappears. Now repeat the sequence for 35c, 40c, 45c and 50c. Once you have done this record results into a table and put into a graph. Safety: A pair of goggles will be worn during the heating part of the experiment in order to protect the eyes. ...read more.

Conclusion

Evaluation: I was pleased with the way the experiment went and thought I was successful in obtaining accurate results. The experiment was conducted fairly; we kept it a fair test by keeping all the variables the same apart from the temperature. I repeated my results three times; I was slightly disappointed that the repeats weren't as similar as they could have been to the previous results. However I still succeeded in proving my prediction. I could have improved my investigation by doing a number of different things; firstly I would of benefited by gaining some extra background information about the collision theory and factors, which affect the rate of reaction. The experiment could have been improved by investigating how the use of a catalyst would affect the rate of reaction. Lastly I could have improved it further by changing some of the other variables such as the surface area or pressure (of the gas). Overall I was pleased with hoe the experiment was carried out and the results obtained. ...read more.

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