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Investigating the rate of reaction between Hydrochloric acid and Sodium Thiosulphate.

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Investigating the rate of reaction between Hydrochloric acid and Sodium Thiosulphate Aim: To investigate the rates of reaction and the effect different changes have on them between Hydrochloric acid and Sodium Thiosulphate. The rate of reaction is the rate of loss of a reactant. It is measured by dividing 1 by the time taken for the reaction to take place. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have chosen to investigate the effect concentration has on a reaction. Na2S2O3 (aq) + 2Hcl(aq) S (s)+ 2NaCl (aq) + So2 + H2O Sodium + Hydrochloric Sulphur + Sodium + Sulphur Thiosuplhate Acid Chloride Dioxide Variables: To create a fair test certain aspects of the experiment that I will have to be kept the same while one key variable is changed. I have chosen to vary the concentration of the hydrochloric acid. The variables I'll try to keep the same are: * The volume of the reactants 10ml of hydrochloric acid and 10ml of sodium thiosulphate. ...read more.


* 3 conical flask - 1 to hold hydrochloric acid, 1 to hold the distilled water and one to hold the Sodium Thiosulphate. * 1 stopwatch - To measure time taken for reaction to occur. * X paper - To aid the decision of when a reaction has occurred. * 1 pair of goggles - To protect eyes. * Sodium Thiosulphate * Hydrochloric Acid * Distilled water Diagram: Method: 1. Set up apparatus as shown in the diagram above with the beakers full with concentrations of Hydrochloric acid: 0 molar, 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar and 1. To do this mix the hydrochloric acid and distilled water using measuring cylinders. 2. Use the thermometer to make sure the liquids are the same temperatures. 3. Place the beakers on top of the pieces of paper with the black X's on. 4. In 4 of the measuring cylinders measure out 10ml of sodium Thiosulphate. 5. Pour one of the measuring cylinders into the beaker and time the seconds taken for the cross at the bottom of the beaker to disappear. 6. Record the results then repeat for the other beakers. ...read more.


Collisions between reacting particles are therefore more likely to occur. Evaluation: In my opinion the experiment was a very big successful. I obtained a substantial quantity of very accurate results from which I was able to create informative graphs. I obtained a good amount of results. However if I was to repeat the experiment I would also test the effect of temperature on the reaction time. The range of concentrations was all right but if I were to do the experiment again I would have concentrations of 0.10m, 1.15m, 1.20m, and so on. This would make my results more accurate and it would allow me to make greater assumptions from my results. It was not necessary in testing the 0M concentration because there was no acid in it to react. To make my results more accurate I could have measured the volumes of liquids more accurately. If I were to repeat the experiment I would have possibly found a more accurate way to measure out the solutions and to determine the molar concentrations. Next time I shall use a burette to ensure that I have an accurate amount of fluid in each test tube. All my results followed the set pattern, but some were not as close to the line as others. This could have been caused by humans. Overall I was extremely pleased with my results. ...read more.

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