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Sodium Thiosulphate Investigation
Member rating: No Rating | Words: | Submitted: Fri Aug 26 2005
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Thursday 30 June 2005 Sodium Thiosulphate Investigation Aim: To investigate how the concentration of hydrochloric acid affect the rate of reaction. Background: Sodium Thiosulphate reacts with hydrochloric acid to form a yellow precipitate. The word equation for this is : Sodium Thiosulphate + Hydrochloric acid = Sodium Chloride + Sulphur + Water The chemical equation for this would be Na2S2O3 + 2HCl = 2Nacl + S + H2O + So2 When dilute hydrochloric acid (colourless) is added to sodium thiosulphate the solution gradually becomes cloudy as a result of the solid sulphur. The 'cloudiness' of the solution increases as the reaction progresses and more sulphur is formed. Eventually the precipitate will look quite yellow in colour. Prediction: By applying the collision theory, I predict that as you increase the concentration of hydrochloric acid (HCl), the reaction with sodium thiosulphate would be faster. However, I also predict that as you decrease the concentration of HCl, the rate of...
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