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The Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate Solution
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The Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate Solution a) Introduction. When Hydrochloric acid is added to a solution of sodium thiosulphate, a reaction takes place in which sulphur is slowly precipitated and the mixture becomes more and more opaque. 2HCl (aq) + Na2S2O3 (aq) 2NaCl (aq) + H2O (l) + SO2 (g) + S (s) This gives us a simple way of finding the rate of reaction. If in each experiment, the same volume of solution is placed in a conical flask, then the depth of the solution will be the same for every experiment. If a cross were to be placed underneath the flask, the cross will disappear when the same amount of sulphur has been formed. If you measure the time it takes, the rate of reaction can easily be determined. Suppose that the mass of sulphur produced when the cross disappears is 1000...
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