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Rates of reaction experiment HCl and Sodium Thiosulphate

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Introduction

´╗┐Rate of reactions The rate of reactions is how fast something changes from its reactants to its products. For a reactions to occur, the particles must strike with enough energy. At the start of the practical only some of the reactions will have enough energy to strike with each other and create energy for the reaction to happen. We can increase the rate of reaction by changing specific conditions in order to increase the rate of collision what will happen is that one of the things what can change it is the temperature because it provides the reactant with more energy. So this means the particles will be moving around more and therefore they are more likely to collide with each other. Another one is the concentration because by increasing the concentration of a reactant we are increasing the number of particles in a certain volume. This means there is more likely to be more collisions because they is more particles with in a small space. Another one could be pressure because by increasing the pressure we are decreasing the space in what the practices can move about in. so this means the practices will be more likely to collide with each other because there is less space for them to move around. ...read more.

Middle

The controlled variable was the amount of hydrochloric acid contraction must be the same. If you don?t have any controlled variables then this experiment wouldn?t have worked. Limitations My limitations could have been: Human error - I could have stopped the stop watch a second after the ?X? had disappeared, thus causing outliers in my work. The stop watch could have been faulty - the button might not have been working well and may not have stopped the timer when I pressed it. Some chemicals may have been left behind in the measuring cylinder/ test tube. Distractions - I may have been distracted by something such as a loud noise and I might have looked away at the exact moment that the X disappeared. The equipment that I used might have been contaminated if it wasn?t washed out properly the last time it was used. This could have caused a faster reaction because of any other unwanted chemicals still inside the equipment Lastly, there could have been a mistake in the measuring. This could have happened if I didn?t have the measuring cylinder at eye level when I poured in the chemicals. Methods The first thing that I did was prepare myself and the area around me for the practical. ...read more.

Conclusion

of reaction 0.4 0.009 1 0.01 2 0.01 Analysis and Evaluation By using my results it does show that as the concentration level goes up the time of reaction goes down. On my result I think we had a limitation because for the first 2 test of 2cm3 didn?t go with the rest of the results so they are ???? so I think we went wrong with that concentration. So for all the other results they matched what the scientific information said in my introduction so that show this experiment still went well even though we went wrong on them two results. The scientist said as the concentration goes up the rate of reaction will increase as well and the second table would show this but because of the 2cm3 results it doesn?t quite work out but for 1cm3 and 0.4cm3 this does go with what the scientist where saying. If I did this experiment again I would make sure that the test tubes where clean because I think we didn?t wash them out properly so it affected aware results because we did 0.4cm3 and then we did 1cm3 so I think so of the substance was still left other and it affected the 2cm3 results. This would make it better because then I think the results will show what they should show because no reactants where left other. ...read more.

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