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How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

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Introduction

How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid? Emma Lazarus - 10Y1 - 10/PLR Temperature and Rate of Reaction Question How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid? sodium thiosulphate + hydrochloric acid � sodium chloride + water + sulphur dioxide + sulphur Na2S2O3(aq) + 2HCl(aq) � 2NaCl(aq) + H2O(l)+ SO2(aq) + S(s) Prediction I predict that the higher the temperature, the more quickly reaction will occur. This is because with heat, the particles of sodium thiosulphate and hydrochloric acid have more energy. This causes them to move around more. It works like this for all substances, not just those two. Chemical reactions require collisions, and if particles are moving around more quickly they are obviously more likely to collide. It is just like in a crowded street. If the people are moving quickly it is more likely that they will bump into each other then if they are moving slowly. It is in this way that particles of solutions react. I found out from preliminary research that the particle theory explains that chemical reactions require a collision between the particles of the reactants, at a certain velocity and angle. If this angle or velocity is not achieved, the substances will not react together. ...read more.

Middle

This is because with more heat, the particles of sodium thiosulphate and hydrochloric acid have more energy. This causes them to move around more. Chemical reactions require collisions, and if two sets of particles are moving around quickly there will naturally be more collisions. However, the collisions require the particles to hit each other at a certain velocity, and if this velocity if not reached then the reaction will just not happen. So, at the higher temperatures, more of the particles were travelling at a high enough speed to collide and react. At the lower temperatures it was more difficult for the particles to collide. Only some were able to reach the required speed and react. wwgg ggw stggggud egg ggnt cgg enggtral ggcogg uk. The particle theory says that for a chemical reaction to occur, there must be a collision at a certain velocity and at a certain angle. Also, the factors that affect the rate of a reaction are the surface area of the solid reactant (if there is a solid reactant), the concentration of the aqueous reactant(s), the presence of catalysts and temperature. In this experiment we were concentrating on temperature, and we were able to draw the conclusion that temperature does, in fact, affect the rate of a reaction, in that when the temperature is higher the reaction takes less time. ...read more.

Conclusion

We found that there was one anomalous result. It is shown on my graph. The reason for this could be that it was timed wrong. Because it was such a low temperature, it took a very long time for the cross to disappear (103 seconds). This meant that it was very difficult to judge the exact moment that it disappeared, as it would have been gradually changing. That could have been misjudged. For all of the results, it was very difficult to start the stopwatch exactly at the same the sodium thiosulphate and hydrochloric acid were put together. They would have already started reacting before the stopwatch was started. wwea eaw steaeaud eea eant cea eneatral eacoea uk! Another possibility for the anomaly is that there was some other factor affecting the reaction rate. The four factors that affect the rate of a reaction are the surface area of the solid reactant (if there is a solid reactant), the concentration of the aqueous reactant(s), the presence of catalysts and temperature. In our experiment the dependant variable was temperature, and if the concentration of one of the solutions had changed for some reason (e.g. if some water was splashed onto it) then the experiment would not be a fair test. For further work to our experiment, we could perform the experiment in a vacuum, as then there would be no other factors that can affect our results, other than temperature, which is all we wanted to be the dependant variable. ...read more.

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