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Investigating Factors Affecting The Rate Of A reaction.

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Introduction

Investigating Factors Affecting The Rate Of A reaction I have been asked to investigate how a chosen variable can affect flex of a cantilever. While doing the investigation there are variables that I must consider : * Weight - The greater the weight of the object, the greater the downwards force will be, this force will pull the cantilever down, and cause the cantilever to bend more or less, depending on the size of this downwards force (weight). * Distance from Table - The further away the weight is from the table, the more it will bend. This is because * Thickness of Cantilever - As I increase the concentration of the Sodium Thiosulphate, there are more Sodium Thiosulphate in the same volume. There fore there is a greater chance of Sodium Thiosulphate colliding, and reacting, with particles of Hydrochloric acid. You increase the rate of reaction. I predict that as the concentration of the sodium thiosulphate increases the rate of reaction will increase. This means that the graph drawn up in my analysis will have positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the concentration is increased. This can be justified by relating to the collision theory. I would expect the results to be like this because as we increase the concentration of the Sodium Thiosulphate, there are more Sodium Thiosulphate particles in the same volume. ...read more.

Middle

So when doing the actual, final experiment we will dilute the concentration of the solutions to 1/10 strength. When recording the results I will note down the "concentration (m/cm )" and "time taken for X to disappear" in a table like the one below: Once I have obtained my results I will plot a graph of rate over concentration to find out the relationship between concentration and rate of reaction. To find the rate of reaction I will do the calculation 1/time but then I will multiply this by 1000 to make the figures easier to plot on a graph. I know from being taught that, as we increase the concentration of the Sodium Thiosulphate the time taken for the "X" to disappear will decrease and that the rate of reaction will increase. E.g. If I double the strength of the concentration the rate of the reaction will double too! I would expect my graph to look something like this: Obtaining Evidence Analysis In this experiment I have found that as the concentration is increased the time taken for the reaction to take place decreases. This means the rate of reaction increases as it takes less time for a reaction to take place, so more take place per second. Using the graphs, with lines of best fit, I can draw a conclusion from my experiment. ...read more.

Conclusion

However, thankfully I used the most accurate measure equipment available to me, a glass burette for measuring concentrations Sodium Thiosulphate and a pipette for measuring the Hydrochloric Acid. Distilled water was used as it is pure and has no impurities because the impurities in the water could have affected my results. I believe that my results are reliable enough to make a valid conclusion as there were no anomalous results and they all stuck close to the lines on best fit on the graphs. Overall, I think this was a good experiment and the best that could have been done with the time and resources available. The results supported my predictions and they seem to be reliable results. If I was to investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid further, then I could investigate another variable. E.g. Temperature change - in accordance with the collision theory. When the temperature is increased, the particles will have more energy and move faster. Therefore, they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and react successfully. - Or Even - Use of a Catalyst - A catalyst works by lowering the activation energy need to overcome the energy barrier. A catalyst would not affect the distribution of the results. Because a catalyst allows the reaction to take place with a lower activation energy, however, a greater proportion of particles will have energy greater than the activation energy. ...read more.

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