Disappearing Cross Experiment

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Disappearing Cross Experiment Plan ==== I must produce a piece of coursework investigating the rates of reaction. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. There are five different factors, which affect the rate of a reaction (1) Temperature (2) Concentration of a solution (3) Pressure of gases (4) Surface area of solids (5) And catalysts. I have chosen to investigate the effect temperature has on a reaction. If I'd of had enough time, I would of done an experiment for concentration of Hydrochloric acid to see what difference the rate of reaction would be here. I wouldn't do pressure of gases, as most are 'invisible' to the human eye. I wouldn't do surface area of a solid, as the two substances we are looking at are liquids. I wouldn't use a catalyst in the experiment, because firstly I wouldn't know which catalyst to use and secondly it may alter the outcome of the experiment if used incorrectly. · Aim ===== To plan and carry out an experiment to discover how to change the rate of reaction. The reaction being studied is between sodium thiosulphate (Na2S203) and hydrochloric acid (HCl). The reaction I am using is: Sodium Thiosulphate + Hydrochloric acid -> Sodium Chloride + water + sulphur dioxide + sulphur Na2S203 (aq) + 2HCl (aq) -> 2NaCl (aq) + H20 (l) + SO2 (g) + S (s) · Equipment [IMAGE] · Diagram · Method 1) With a piece of paper put on a bold cross, which is easy to see. 2) Put the conical flask on top of the cross with 20ml³of hydrochloric acid. 3) Add 20ml³ of sodium thiosulphate into another flask and heat to specific temperatures with the Bunsen burner (and using a thermometer). 4) Once it is at the correct temperature, add it to the hydrochloric acid and start the stopwatch.

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