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An investigation into the factors that affect The rate of reaction between Sodium Thiosulphate & Hydrochloric Acid

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An investigation into the factors that affect The rate of reaction between Sodium Thiosulphate & Hydrochloric Acid AIM: to investigate into the factors that affect the rate of reaction between Sodium Thiosulphate & Hydrochloric Acid. APPARATUS: 50ml Sodium Thiosulphate 10ml Hydrochloric 100ml conical flask distilled water Laminated paper with a x on it Measuring cylinder Stop watch Pipette DIAGRAM: ok this is more or less what my coursework was like i made quite a few changes but hey thats life. hope you find it useful and i will remember this when were at KES! PLAN: there are many factors that could change the rate of reaction- temperature of the liquids, concentration of the liquids, adding a catalyst, the size of particles if one part was a solid. I have chosen to change the concentration of Sodium Thiosulphate each time for the experiment. This is because I feel it is the easiest to do with the time and apparatus available. I am changing the concentration of Sodium Thiosulphate and not the Hydrochloric Acid because there is more volume of Sodium Thiosulphate. I will make up the concentrations of the Sodium Thiosulphate- 0.25 mol dm-3, 0.23 mol dm-3, 0.2 mol dm-3, 0.18 mol dm-3, 0.15mol dm-3, 0.13 mol dm-3 and put them in test tubes. ...read more.


ANALYSIS MY RESULTS: when you mix the clear liquids of Sodium Thiosulphate and Hydrochloric acid they react to form a yellow precipitate of sulphur. The sulphur starts to form immediately, but takes a while for there to be enough sulphur (product) to make the cloudy precipitate thick enough to hide the cross. The equation shows the reactants and products in this reaction. Na S O + 2HCl 2NaCl +SO +S +H O The graph shows a linear negative correlation showing my prediction was correct- the more concentrated the solution the quicker the reaction would occur. The more concentrated the solution of Sodium Thiosulphate the quicker the reaction occurred because there were more sodium thiosulphate particles so a bigger chance the hydrochloric will meet a particle and react. Using a lower concentration took much longer for the solutions to react than a higher concentration because the particles were more widely spread in the water so the number of collisions between the sodium thiosulphate and the hydrochloric acid were be limited. This would mean that if this experiment was being done for industrial purposes a higher concentration would be used because it reacts quicker. Although if you used a really high concentration the reaction wouldn't be very successful because there would be too much sodium thiosulphate to react with the hydrochloric acid. ...read more.


When adding the solutions together one time they might have mixed quicker than another time, this would mean that the time could be unreliable because the reaction could have started earlier. It is hard to know when the solutions have fully reacted this is why we use a piece of paper with a cross on it to time how long it takes for the precipitate to appear. To make the results more reliable you could use a logit sensor. This is a light beam that penetrates through the solution when the precipitate becomes too thick so that the light beam cant get through this time is recorded on a computer. This means that the time taken will be a lot more accurate because you don't have to rely on the peer reactions of a human. It was hard to start the stopwatch as soon as the solutions were added together. You could use the logit sensor to make it more accurate. To further develop the investigation you could investigate- How much you could increase the concentration of sodium thiosulphate without the solution becoming saturated. ? Changing the temperature- changing the temperature could help speed up the reaction because higher temperatures give the particles more energy so they move around quicker so collide with each other quicker and with more force increasing the chance of a successful reaction. ...read more.

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