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My aim is to investigate whether concentration affects the rate of reaction between a piece of Magnesium Ribbon and Sulphuric Acid.

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Introduction

GCSE Chemistry Coursework Sheena Raj AIM- My aim is to investigate whether concentration affects the rate of reaction between a piece of Magnesium Ribbon and Sulphuric Acid. Prediction/Hypothesis- I think that the higher the concentration used, then the quicker the reaction and the lower the concentration, then the slower the reaction. Particles in solids, liquids and gases are always moving. This movement is much greater in gases and in liquids more than solids. In a reaction mixture, the particles of the reactants collide. Not every collision leads to a reaction. Before a reaction occurs, the particles must have a sufficient amount of energy. This is called the activation energy. If a collision between particles can produce sufficient amount of energy, i.e. if they collide fast enough and in the right direction, a reaction will take place. A reaction is speeded up if the number of collisions is increased. The higher the concentration of Sulphuric acid used, then the less time it takes for the magnesium to disappear giving a quicker reaction rate. Variables- the concentration of Sulphuric acid used will be the independent variable as it varies, and the time taken for the rate of reaction to take place, i.e. ...read more.

Middle

Preliminary test results- MOLAR AMOUNT OF ACID (CM�) AMOUNT OF WATER (CM�) TIME (S) (MINS) 1 10 15 2�24 1 10 15 2�21 1 10 15 2�30 Modified plan- After doing my preliminary experiment, I realized that the concentrations made the reaction a lot slower than we expected. Therefore we needed to change the concentrations to more appropriate ones. Each molar of acid is experimented three times and then averaged so a graph can be plotted. This makes the results a lot more accurate than just doing the experiment once or twice each. For each molar of acid i.e. 1, 2, 3 will be using the following concentrations: 15cm� acid + 10cm� water = 25cm� 20cm�acid + 5cm� water = 25cm� 25cm�acid + 0cm� water = 25cm� The same amount of magnesium ribbon (1cm) will be used for each experiment. Also the same measuring cylinders and conical flask will be used/ I will make sure that the water and Sulphuric acid do not contaminate each other in the measuring cylinders. Results table- MOLAR AMOUNT OF ACID (CM�) AMOUNT OF WATER (CM�) TIME (SECS) 1 15 10 43.54 1 20 5 31.22 1 25 0 20.47 1 15 10 49.37 1 20 5 33.06 1 25 0 20.00 1 15 10 46.00 1 20 5 28.63 1 25 0 21.39 2 15 ...read more.

Conclusion

Another person could have double checked that all the 1cm strips of Magnesium ribbon were cut to the same length as it could have affected the reaction times. Other than that, I am happy to say that the investigation went pretty well. Although I did find that I had one anomaly which I could profoundly see from the graphs. The concentration for this specific anomaly was; 15cm� of Sulphuric Acid (3 molar) + 10 cm� of water. This could have bin due to the lack of stirring or maybe one of the measuring cylinders became contaminated. My results were reliable as I had done each experiment at least three times and had averaged out the times to be then able to plot two graphs. I think that the results are sufficient enough support the conclusion as there weren't any major problems other than the one minor anomaly, which can b re-done to see whether I can obtain better results. Next time, I could try changing the concentrations of the acid making it either higher or lower, which would obviously change the volume. I could also change the temperature by itself, or change both the concentration and the temperature to see what effects that would have on the results. In conclusion, I am very happy with my investigation as it has produced very good results, and has proved my prediction. ...read more.

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