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# To investigate how the rate of reaction changes with the concentration. The rate of reaction is how long it takes to the reaction to take place.

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Introduction

Investigation of Rates of Reactions Aryana Masoudi Kashani 10F Aim: To investigate how the rate of reaction changes with the concentration. The rate of reaction is how long it takes to the reaction to take place Theory: My initial theory is that the increase in concentration of Hydrochloric Acid atoms is inversely proportionate to the reaction rate. As the success rate is increased there are more collisions with magnesium atoms this then gives a product, which is formed more quickly. Prediction: My prediction is that the increase in concentration of the acid then the higher the rate of the reaction will be. I am saying this because of the collision theory. The higher the concentration of acid then the higher the number of acid particles present per 100cm3 of acid. This means that there will be more collisions per second, which means there will be more successful collisions per second, so the rate of reaction will increase. More successful collisions shall happen because there is enough energy in the chemical reaction to break and form new bonds between the other particles, which is called a successful collision. ...read more.

Middle

The fact that we will not shake or stir the Hydrochloric acid shall be kept constant as this would make our results unreliable. The weight and size of the magnesium ribbon will be the same through out the experiment. Results Table: Conc. mol/dm� Experiment 1 Time in sec Experiment 2 Time in sec Average (s) Rate of Reaction (s) .5 118.43 138.72 128.57 .0078 1 15.320 12.060 13.690 .0700 1.5 5.6500 4.7200 5.1800 .1900 2 2.9300 2.0800 2.5000 .4000 2.5 2.2400 2.3700 2.3000 .4350 Analysis: Conclusion: The graph shows that as the concentration is increased so is the reaction rate. As the Concentration doubles the rate of reaction does not. This is proven with in the graph. As with .5mol of concentration the rate of reaction is.0078. If we double the concentration then we will expect that the result that we got with the .5mol of concentration to have doubled as well. But the result for the 1mol concentration was only .07, which in fact; it is nine times bigger than the results of the .5mol concentration. But as we double the concentration to 2mol concentration it is obvious that this time it has not becomes nine times bigger. ...read more.

Conclusion

Overall I think that out results were reliable since we repeated the experiment twice so as to minimise the risk of more anomalies happening. I think that if the experiment were carried out in a more controlled environment. By controlled environment I mean things such as light can't effect our results as much as well as temperature of the room shall have to be kept constant. If we did the experiment in a more controlled environment where such factors can't affect our results as much then it would improve the experiment and the results. Also if the bung fitted more easily into the test tube assuring that it would be placed with more ease and therefor reduce the risk of anomalies. If an alternative experiment were carried out then I would time how long it takes for the whole of the magnesium strip to dissolve in each of the concentrations used. The last improvement to my procedure is that I should check for gas leakages where the bung is placed into the conical flask, a smear of Vaseline would help me do this. This would there for improve the accuracy of my results, as their would be a more accurate reading from the gas syringe. ...read more.

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