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Rates of Reactions.
Member rating: No Rating | Words: | Submitted: Thu Feb 12 2004
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Rates of Reactions The rate of a chemical reaction depends on: - Concentration - Temperature - Surface area - Catalyst I investigated the effect of concentration using the reaction between Sodium Thiosulphate and Hydrochloric Acid. Sodium + Hydrochloric = Sodium + Water + Sulphur + Sulphur Thiosulphate Acid Chloride Dioxide Na2S2O3 + 2hCl = 2NaCl + H20 + S + S02 When the reactants are mixed, the solution becomes cloudy as sulphur is precipitated. Prediction I predict that if the concentration of the acid increases, the rate of reaction will be quicker. This will happen because there will be more freely moveable particles to collide with each other. These collisions have enough energy to result in breaking bonds in reactants. The atoms then regroup and form new bonds to form the products. Concentration of acid Test 1 Test 2 Test3 Average 0.1 22.25 19.50 27.28 23.01 0.25 17.16 18.03 16.67 17.28 0.5 12.12 11.50 13.54 12.38 1.5 11.35 11.50 12.01 11.62 2.0 10.97 11.05 10.86 10.96 These are the results we obtained when we used different concentrations of acid: Concentration of acid in molar Time in seconds Conclusion ...
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