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An Experiment To Test The Reaction rates between sodium Thiosulphate and Hydrochloric Acid.

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Introduction

An Experiment To Test The Reaction rates between sodium Thiosulphate and Hydrochloric Acid. Plan I have begun an experiment to measure the rate of reaction between Thiosulphate and Hydrochloric acid the fact that i am going to look at is concentration. I will dilute the thiosulphate with water to change the variable concentration. My investigation will be situated in a school labratory. I will do at least five different concentrations in duplicate. To help me complete my investigation I will need a conical flask, clock, 3 measuring cylinders and two beakers which will contain the Sodium Thiosulphate and Hydrochloric acid, and a piece of white paper with a black cross marked on it. To complete my investigation I will have to measure out 25ml of Hydrochloric acid in measuring no.1, then pour it into the conical flask which has already been placed on the paper with an X marked on it. Now I can measure out 25ml of sodium thiosulphate in measuring cylinder no.2 so I do not contaminate the 2 solutions before i have got everything ready. ...read more.

Middle

I will keep the Hydrochloric acid fixed at 25ml and will do other reactions five times in duplicate. In this experiment, only one concentration was altered, the sodium thiosulphate and the Hydrochloric acid was kept constant. I think I will find that the speed of reacton will be proportional to the concentration of the sodium thiosulphate. If the sodium thiosulphate is doubled the speed is doubled, this is because the ions are closer together and more collisions occour and so the solution clouds quicker. The more often they collide, the more chance they haver of reacting. So the higher the concentration (the more acid and thio there is) the quicker the reaction will take place. Results Table Hydrochloric Acid ML Sodium ThiosulphateML Water ML TimeML 25 25 0 90 25 25 0 85 25 23 2 83 25 23 2 84 25 21 4 104 25 21 4 107 25 19 6 109 25 19 6 120 25 17 8 131 25 17 8 127 25 15 10 185 25 15 10 181 Conclusion My prediction was correct, the higher the concentration the quicker the reaction. ...read more.

Conclusion

To make my experiment more of a fair test i could have used a digital stop watch which would be more reliable that a clumsey clock and also more accrate. When looking down through the beaker it was personal judgement whether the X had dissapeared and i sometimes wrote the time down and looked back through the beaker only to see the cross again, so it was an inaccurate method which possibaly tipped the balance to make the experiment an unfair test, this could have been the problem whith the second set of my reading. I evaluated the two problems of timing and viewing and come up with a sollution to the problem, it would not be rescourceful but it would be accurate. I could fix up a laser to a stand and clamp and connect the laser to a reciever which would recieve a signal from the laser to stop the clock when the sollution is cloudy enough to make the x dissapear i predict that this setup would give me a mmore accurate reading if i were to do the experiment again. ...read more.

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