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Investigate the rate of reaction usuing Sodium thiosulphate and Hydrochloric acid

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Chemistry Coursework Find the effect of temperature on the rate of reaction using :- Sodium thiosulphate + Hydrochloric acid Sodium chloride + Sulphur dioxide + Sulphur Plan The rate of reaction is the speed that the reaction occurs at. It can be effected by the following: o Concentration of reactants o Temperature o Surface area of reactants o Presence of a catalyst Out of those factors, I am going to investigate the effect temperature has on the rate of reaction. I will do this by recording the time it takes for the cross to disappear. I think that as the temperature increases, the rate of reaction will increase. The graph below shows what I think my results will look like. If you increase the temperature by 10�C, you approximately double the rate of many reactions. The reason why I think that increasing the temperature will cause the rate of reaction to increase is because of the collision theory. The collision theory says that the particles of the reactants must collide with each other, with enough energy in order to be effective and make the chemical reaction occur. ...read more.


In order to do my experiment I will need the following equipment: * Sodium thiosulphate solution (200cm�) * Hydrochloric acid (200cm�) * Water (unlimited supply) * Ice * Test tubes (x10) * 250ml beaker (x3) * Thermometer * Measuring cylinder * Pipette * Safety glasses * Tongs * Bunsen burner * Matches * Gauze * Tripod * Heatproof mat * Whiteboard pen * Stopwatch Method 1. Collect all the equipment. 2. Put on your safety glasses. 3. Measure out 200cm� of sodium thiosulphate into a beaker and mark on the beaker 'Sodium thiosulphate' with the whiteboard pen. (This is so that you do not get it mixed with the hydrochloric acid.) 4. Now measure out 200cm� of hydrochloric acid into a beaker and again, with the whiteboard pen mark the beaker, this time with 'Hydrochloric acid.' 5. Put some water into the third beaker and place it on the tripod, with the gauze to heat (using a bunsen burner), put the thermometer inside the water so that you can regularly check the temperature. ...read more.


15. Once you have completed this put all the equipment away, if necessary wait for the equipment to cool before putting it into the cupboard. My preliminary results show that my method, my chosen temperatures and the amount of hydrochloric acid and sodium thiosulphate is sufficient and will provide accurate, reliable results. In order to keep my test fair, I will use the same hydrochloric acid and the same sodium thiosulphate. I will use the same amount of both the hydrochloric acid and sodium thiosulphate and I will not use a catalyst. Analysis My graph shows that as the temperature increases, the time taken for the sodium thiosulphate to react with the hydrochloric acid decreases. This, therefore, agrees with my prediction, that as the temperature increases, the rate of reaction also increases. The trend of my graph is a negative curve. It is negative because at 10�C there is less energy than at 100�C, so there are fewer collisions and these collisions are with less force. It is a curve because as the temperature increases the reaction can only go so fast, and there is a limited amount of sodium thiosulphate and hydrochloric acid. ...read more.

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