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Chemistry Coursework Plan: The aim of this experiment is to analyse and understand rates of reaction.

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Introduction

Chemistry Coursework- Plan Aim: The aim of this experiment is to analyse and understand rates of reaction. In order to understand this, I have experimented using different concentrations of hydrochloric acid and magnesium strips. Timing how long it takes for the magnesium to dissolve. This experiment and following information will give me a clear understanding of this Preliminary work: Before this experiment, we carried out a number of other experiments in order to investigate the affect of things like concentration and temperature had on a reaction between an acid and usually marble. We used the laptops using a programme called "Science investigation". We investigated the time it took different concentrations of acid to dissolve pieces of marble.. We also investigated different ways of looking at the results for example, recording the time increase during the actual experiment converting this time into the rate of reaction. This helped give me an idea of the type of experiments I was doing and helped me decide what I wanted to do and how I wanted to do it. My pilot study was extremely important as well because it allowed me to check how well my experiment would be done and if any changes needed to be made. I changed my experiment. I used magnesium instead of marble, because it is more reactive. During the pilot study I was also able to see which concentrations of acid would be ideal in order to collect a more accurate set of results. These previous experiments and plans were extremely helpful and ensured that I would be able to carry out a smooth and efficient experiment. Understanding this I was able to make a hopefully right hypothesis. ...read more.

Middle

results for example, it might be slightly acidic I have therefore chosen to use distilled water in order to be absolutely sure that it won't affect the results. In this experiment my input variable is the concentration of hydrochloric, which will be changed to different concentrations in order to see the different effects it has. My output variable is the time taken for the magnesium to dissolve or the rate of reaction. This is what I will be measuring to see what affect changing the concentration has had on the experiment. I think overall my plan is a good one as it basically allows for a quick, efficient and fair investigation into how different concentration of hydrochloric acid can affect the rate of reaction. I have tried to be a precise as possible with any mistakes or miscalculations, which might occur so that my results are accurate. Results These were the results after carrying out the experiment. Concentration of hydrochloric acid Time in first attempt Time in second attempt Time average 1.0 10.93 10.40 10.67 2.0 15.23 15.89 15.56 2.5 20.34 19.29 19.82 3.0 27.72 24.83 26.28 3.5 32.95 34.00 33.48 4.0 37.53 38.04 37.79 Both the graph and the results above supports my original prediction of: the more concentrated the acid the faster the rate of reaction because it shows the time difference between the different strengths of acids. In a higher concentration there are more acid particles to react with the magnesium ribbon and therefore it is eaten away faster. I conclude that changing one factor does have a significant effect on the rate of reaction as we have seen. Looking at the set of results obtained, you can clearly see that they all follow the expected pattern. ...read more.

Conclusion

I conclude that changing one factor does have a significant effect on the rate of reaction as we have seen. Looking at the set of results obtained, you can clearly see that they all follow the expected pattern. This is pattern suggests that the reaction rate increase when the concentration of the acid increases because if you increase the concentration of the acid you are introducing more particles into the reaction which will in turn produce a faster reaction because there will be more collisions between the particles which is what increases the reaction rate. The evidence I have been able to gather from this investigation seems to lead to a quite firm conclusion. I might not have been able to find the exact speed of the reactions but the pattern seems to be correct as I have repeated readings three times and as it agrees with the information I have researched. I used the variable of concentration, which seemed to be of a good choice as it would show the results of how more acid molecules reacting with magnesium, would result in a faster reaction. There will always be ways in which you can improve your investigations and the same thing goes to my investigation. Every time I washed a test tube or a measuring cylinder, I did not dry it before using it. This may have affected the rate of reaction, as water would dilute the acid. To improve my results, I could dry the test tubes and the measuring cylinder after they are washed to prevent diluted acids. The size and weight of the magnesium would have affected the rate of reaction. The experiment could be improved by measuring, adjusting and weighing the magnesium ribbons so they all are the same size and weight. ...read more.

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