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Rate of Reaction Investigation

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Rate of Reaction Investigation Planning In this investigation I will find out what affects the rate of reaction of sodium Thiosulphate - Na2S2O3 - and hydrochloric acid - HCl - and will explain the behaviour of the reactants. Na2S2O3(aq) + 2HCl(aq) + 2NaCl(aq)+ SO2(g) + S(s) + H20 Sodium + Hydro- + Sodium + Sulphur + Sulphur + Water Thiosulphate chloric Chloride Dioxide Acid First, I will list all the factors that would affect the rate of reaction in this investigation. * Temperature - hotter particles become more active and create faster collisions. * Concentration of reactants in solution - amount of particles of reactants in solution would vary the rate of reaction. * Volume of solution(s) - the volume of the solution may affect the rate of reaction, by having more or fewer particles colliding in the solution. * Surface area - this factor does not apply in this investigation because there are no solids involved. * Pressure - amount of pressure may vary on a barrier (should one be placed on top of the reacting solution) that would prevent Sulphur Dioxide from leaving the solution. Not applicable in this investigation. * Catalyst - a Catalyst will not be used in this investigation therefore this factor is not applicable. The factor I am going to investigate will be: * Temperature. ...read more.


Method First here is all the equipment that will be needed to conduct both the preliminary and main experiment. * 5 beakers of water increasing in concentration by 10ml each time, * 5 beakers with 5ml of Hydrochloric Acid, * 5 beakers of Sodium Thiosulphate decreasing in concentration by 10ml each time, * A stop watch, * A thermometer, * Goggles, * Bunsen burner, * Tripod, * Gauze, * Piece of paper with bold cross drawn on, * An observer. Preliminary First we will set up the experiment as shown to the right, with 5 tests in total, each beaker we will add 10 ml water to so the concentration of sodium thiosulphate get less and less each time, then we add the water, hydrochloric acid and the sodium thiosulphate together and start the stop watch, and timed how long it took the solution to turn so misty that the observer could no longer see the cross on the paper through the beaker. Then we recorded the results. Main The main experiment is similar to the preliminary experiment, but this time we heated the Sodium Thiosulphate to different consecutive temperatures before we added it to the Hydrochloric Acid and Water and observed the reaction. We put the Sodium Thiosulphate, along with a thermometer, in a beaker and put it on a gauze on a tripod above a Bunsen burner flame and heated it before beginning the reaction observation process and then recorded the results. ...read more.


70?c In the graph showing the results for the temperature experiment overleaf, all of the results follow the line of best fit, apart from the result at 25?c, which seems to be slightly anomalous on the graph. But in the results table, due to one minor accident of some sort during the experiment, this result has a slightly longer average reaction time than expected. The results plotted on the graph are at a strong negative correlation, which shows that the hotter the temperature, the quicker the reaction time. This is because the more the reactants are heated, the more active the particles in the reactant become, which makes the collisions between the particles faster and stronger, causing a faster reaction rate. I think our results are very accurate, with few anomalous results, and certainly none that greatly affect the investigation. Possibly next time I would take more care over reading off the temperatures, and be more exact, and the same for measuring the amounts of solutions, so the results would be even more accurate. I may conduct further experiments that take the temperature above 70�c, because I believe the reaction times may decrease even more as the temperature rises, possibly up to 100�c. the rule for this investigation is that the reaction rate improves as the temperature rises, but this may change at a greater temperature, which could be investigated further. Graph showing results for Temperature experiment(?c) ...read more.

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