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Investigate the factors that affect the rate of the chemical reaction between Sodium thiosulphate and Hydrochloric acid.’

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Introduction

Title: `Investigate the factors that affect the rate of the chemical reaction between Sodium thiosulphate and Hydrochloric acid.' Aim: By carrying out this SC1 we are looking to see how the factors affect the rate of the chemical reaction between Sodium thiosulphate and Hydrochloric acid. There are many factors that affect this. This experiment is designed to investigate how the variation of the concentration of one of the reactants affects the rate of a reaction. This experiment is also investigating how temperature affects the rate at which the reaction takes place. Introduction & Theory: When hydrochloric acid is added to sodium thiosulphate, a precipitate of sulphur forms slowly. If the time needed for a certain amount of precipitate to form is recorded, this can be used as a measure of the rate of the reaction. A simple method of estimating when a fixed amount of sulphur has been formed is to carry out the reaction in a container standing on a piece of white paper on which a very visible cross has been marked. On looking down on the cross through the mixture in the container the cross will be seen to gradually become fainter as the precipitate forms and eventually will disappear when a certain amount of precipitate has been formed. ...read more.

Middle

on `Rates of Reaction' Method /Variables - Investigation of the effect of concentration was carried out using different dilution of a solution of sodium thiosulphate in water in a reaction with a constant amount of Hydrochloric acid. The rate of the reaction was measured by the time taken for the resulting precipitate of sulphur to obscure a cross placed on a piece of paper under the reaction flask. Since a slower reaction gives a longer time, the rate of reaction can better be represented by plotting the reciprocal of this time against the concentration of the thiosulphate. The graphs show my prediction, as concentration rises the rate of reaction rises. The more ions (or molecules) there are in a given volume of the reacting liquids, the more chance they have of "colliding" with each other and reacting. (In this particular reaction I would expect the rate concentration graph to be a straight line, this may not be the case for other reactions.) The effect of temperature on the rate of reaction was investigated using this same reaction, by keeping the concentrations constant and pre-warming the beaker of thiosulphate to different temperatures before adding the Hydrochloric acid that would also be pre warmed to the same temperature. ...read more.

Conclusion

4. Tip the solution away. Was out the beaker with propane and dry it. Repeat the experiment using different volumes of sodium thiosulphate solution and water, but always using 5 cm3 (0.15m) of hydrochloric acid, each time noting the time taken for the cross to disappear. 5. The following volumes of sodium thiosulphate and water should be used. Sodium thiosulphate cm3 Water cm3 50 0 40 10 30 20 20 30 10 40 Temperature experiment: The procedure for the concentration experiment is repeated, using just one concentration of sodium thiosulphate solution, but at different temperatures. The solutions are warmed to near the required temperatures before the acid is added. The temperature is recorded when the solutions are mixed. The following volumes of sodium thiousulphate and the different temperatures were used. Temperature (oC) as close to as possible Sodium thiosulphate 20 50 30 50 40 50 50 50 60 50 The equipment I need to carry out the work and to obtain my results is: � Sodium thiosulphate solution � Hydrochloric acid � 250 cm conical flask � -5c -110c thermometer � 10cm3 / 50cm3 measuring cylinder � heat proof mat � Bunsen burner � Wire gauze � Tripod � Stop watch � White paper with cross on � A pair of tongs Results: [image003. ...read more.

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