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Chemistry Coursework: Investigating the effect of Concentration on the Rate of Reaction

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Introduction

Pritesh Mistry 10H 20/5/01 Chemistry Coursework: Investigating the effect of Concentration on the Rate of Reaction In the investigation that I am going to do I am going to try and find out how the rate of reaction is affected by different concentrations of acid, ranging from 1M to 2.5M. Variables The variables in this experiment will be the concentration of the acid. The surface area of the marble chips could also be a variable, but not to such an extent because this is only variable as there is no accurate way in measuring the surface area of the marble chips. In this case the key variable being the concentration of the acid. The elements that will be kept constant will be temperature (kept at room temperature), the size and weight of the marble chips, the volume of acid, and the time intervals at which the results will be recorded (10 secs). Prediction I predict that if you increase the concentration of the acid then it will increase the rate of reaction. The reason for this is that in a more concentrated acid there are more acid particles, which means more successful collisions, which results in a faster reaction. ...read more.

Middle

From this I finally decided to use medium size marble chips as this was a choice from large, medium and small, so using the medium sized chips would be fair. The concentration of acid which I finally decided to use was a range of 1M - 2.5M; this is because I would get a good range of results as well as it showing the rates of reaction increasing with the concentration of acid. If I would have used anything more concentrated then the rates of reaction would be too quick for me to get a good amount of results to do any conclusions from. The temperature of the experiment was decided to be done at room temperature, because if we had decided to do the temperature to another degree, then there would be no guarantee that I would be able to keep the temperature constant. If the temperature was to change then it would affect the rate of reaction, making it faster for some and slower for others, therefore making the results unreliable and inaccurate. Analysing Evidence & Drawing Conclusions By looking at the graph you can quite easily see that from the four lines drawn, what I had predicted about the more concentrated acid will react quicker is true. ...read more.

Conclusion

There are one or two improvements that could have been made to the investigation, and one of then is the accuracy of the measuring cylinders, seeing as they only went up to 100, any results after that had to be estimated. Another improvement could have been to the chips used, even though the same amount had been used and they had been weighed to the same weight every time, they were still not exactly the same. One other improvement could have been to have done the investigation in one day at the same temperature. The investigation was done over a period of two days, which meant that thee would be a change in the temperature, and if the room was hotter on one day then the other, then that could cause the acid to react faster because it is hot and gaining energy. Besides these three improvements the investigation was ok. My conclusion is only valid for the range of acids I used, so for some further work, I would do the investigation using more acids. Other things that can be done are to do the investigation under different temperatures, or use different sized marble chips, or even use more acid. As an alternative, the investigation could be done using different materials, such as magnesium ribbon. Overall, I was happy with the investigation and my results. ...read more.

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