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Investigate the affects of concentration on rates of reaction.

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Introduction

Louise Hewitt Investigate the Affects of Concentration on Rates of Reaction Plan: I am going to investigate the affects of concentration on rates of reaction. I will do this by investigating the affect that different concentrations of hydrochloric acid have on a certain amount of marble chips. I want to see how long it takes for a set amount of carbon dioxide to be given off once the acid starts reacting with the marble chips. For a chemical reaction to take place the reacting particles must: A) Collide with sufficient energy or force for a reaction to take place. B) Collide head on so the reaction can take place. For this experiment I will be using the following apparatus: 1 boiling tube 1 bung seal 1 delivery tube 1 clamp and clamp stand ...read more.

Middle

The variables that may affect this experiment are: * Size of marble chip - The size of the marble chip will have an effect on the experiment because the larger the surface area, the more acid that will come in contact with the marble and will be able to react more. I did an experiment to see how the size of the marble chip affected the rate of reaction. These are the results. Small Marble Chip 14 Seconds Medium Marble Chip 25 Seconds Large Marble Chip 51 Seconds * Concentration of Hydrochloric Acid - The proportion of hydrochloric acid in the solution. * Volume of Acid - The amount of hydrochloric acid that will react with the marble chips. ...read more.

Conclusion

This is because the more concentrated hydrochloric acid will have more molecules, so there will be more chance of the calcium carbonate ions colliding and reacting with the hydrochloric acid. Evaluation: I think that my experiment worked well, as my results on my graph do appear to be accurate and they agree with my hypothesis. While conducting my experiment my results were all similar, and after I had repeated the anomalies they all fitted in with each other, which was very encouraging. Although I am happy with the quality of my results there are ways in which my experiment could have been more accurate. There was no way I could have made sure the room temperature had stayed the same during my experiment, so to make the test more accurate I could have done carried out my testing in a temperature controlled environment. ...read more.

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