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Investigating how mixing sodium thiosulphate with HCL will react and what variables affect the rate of reaction.

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Introduction

Investigating how mixing sodium thiosulphate with HCL will react and what variables affect the rate of reaction Plan I plan to mix 50cm� of HCL with 50cm� of distilled water then stir the solution for 10 seconds. Then leave the solution for 20 second to settle before I add my variable sodium thiosulphate. First I will add 2.0g of sodium thiosulphate and time it using a fair stopwatch from after the 2.0g was added until the cross under the solution becomes cloudy and hard to see. I will also take the temperature of the solution after I have finished taking the time. I will then repeat this method in order to get two results for each one to find a average. I will repeat the experiment exactly only changing the amount of my variable sodium thiosulphate. I will do two using 0.5g of sodium thiosulphate and then repeat for 1.5g, 2.0g keeping every other part o the method the same to get fair results. I believe that the more sodium thiosulphate added the faster it will take to react so the quicker the cross disappears I think this because the sodium thiosulphate is a powder therefore it will have a large surface area the more added and I know that surface area affects rate of reaction. ...read more.

Middle

Prediction/Hypotheses My prediction is that the more thiosulphate added the quicker the rate of reaction because sodium thiosulphate has small particles with a large surface area in relation to their volume so more particles are ready for collisions this means they will react quicker. Also the more thiosulphate added the more concentrated the solution becomes, in a reaction where one or both reactions are in high concentration the particles are crowded close together and will collide with each other more often, resulting in an increased number of successful collisions. Another reason why I predict that the more thiosulphate added the faster the rate of reaction is temperature. The higher the temperature of the reactants the quicker they move around so the more likely they are going to collide with each other. The room tempeture is 22� so I predict that the solution after the thiosulphate added will be around 22�. This is a fairly high temperature so the reactants are going to move around quickly so they are more likely to collide and react. Here is a table of my predicted times after the thiosulphate added Thiosulphate in grams Time for cross to disappear in seconds Tempeture in degrees 0.5 30 22 ...read more.

Conclusion

Maybe next time we could use a indicator to see when it has reacted so it changes to a different colour, then the results would be more accurate. Other than that I think the method we used was the best method to find out what effects rates of reactions. The quality of my results is very good because I learnt from the mistakes in my preliminary experiment. There is defiantly enough evidence in my results and graph to make conclusions, I conclude that the more thiosulphate added the quicker it reacts with the HCL this is because the solution becomes more concentrated, the surface area of he thiosulphate particles is large in relation to the volume and tempeture of solution was fairly high. If I wanted to take this experiment any further I would carry it on this time adding 3.0g,3.5g,4.0g ext. of thiosulphate I would also do it four times ach one to find a more accurate average and change the shape of the contain to see if this effects the rate of reaction. I would also vary the tempeture of the solution to prove that it effects the rate of reaction ...read more.

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