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How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

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How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid? GCSE chemistry investigation Aim The aim of this investigation is to find out how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid Apparatus * Sodium thiosulphate (Na2 S2 O3) * Hydrochloric acid (HCl) * Water * Piece of paper * Black marker pen * Conical Flask * Heat proof mat * Wire gauze * Bunsen burner * Tripod * Large beaker (x2) * Thermometer (x2) * Stop clock * Measuring cylinder (x3) * Beakers (x3) * Test tube (x2) * Blocks of ice Theoretical background I know that a number of things of things can effect the reaction rate such as the temperature. When the temperature increases the particles all move quicker, as they have more energy. If they move quicker they are going to have more collisions, increasing the reaction time. Another factor is the concentration of the solution, which also increases the amount of collisions, and therefore the reaction time. If a solution is made more concentrated it means there are more particles of reactant bouncing about between the molecules which makes collisions more likely. The surface area also increases the reaction rate, by more collisions because there is a larger area for the particles to hit. ...read more.


Fair test In order for my findings to be valid the experiment must be a fair one. I will use the same person each time for judging when the X has disappeared. If we were to change who the observer was then we might not get an accurate reading, as our eyesight's could be of different quality. I will also make sure that the same observer is used for reading the temperature of the thermometer, who will read it at eye level each time, to get an accurate reading. I will make sure that the measuring cylinders, and beakers with the HCl, sodium thiosulphate, and water will not be mixed up, by putting on labels to say what they are. will not be mixed up. The amount of HCl will be 5 cm3 each time, the amount of thiosulphate will be fixed at 20cm3, and the amount of water will be 39cm3. I will make sure each time I take a reading I will use the exact same volume, and again measure at eye level. I also will wear goggles and an overall, in case of spillages. I will keep the surfaces clear, and tie up my hair. Also, to make it a fair test I will use the same black cross each time, being careful not to get it wet. ...read more.


I would do this by placing a light sensor underneath the solution. This solution could be held on top of a wire gauze, which can be held on top of a tripod. I will then place a light source above. This would be a very accurate way, and you would be able to see exactly how quickly the reaction takes place, to the second. This would account for any human error when timing, of poor human eyesight. Another way I could improve this experiment is to heat up the Hydrochloric acid (HCl) at the same time. This would make the overall temperature of the solution the same temperature, which I wanted. However when I didn't heat it, it meant the HCL, which was at room temperature would have cooled the solution down slightly. A final thing I could do to improve my investigation is heat the sodiumthiosulphte, and the water together in the same test tube. Once the solution has reached its required temperature then we could pour it into the beaker straight away then add the HCL, as apposed to poring the water and the sodiumthiosulphate in separately. This would mean I could add the HCl to the solution quicker, and therefore prevent cooling of the solution, before the reaction takes place. I feel this experiment went well. I kept it a fair test, and each time I took a reading at different temperature I kept the other variables the same. ...read more.

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