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Investigating the effect of the size of marble chips on the rate of reaction with hydrochloric acid.

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Introduction

Investigating the effect of the size of marble chips on the rate of reaction with hydrochloric acid Aim: To investigate the effect of the size of marble chips on the rate of reaction with hydrochloric acid. Prediction: In this experiment, I predict that the smaller the size of the marble chips are, the faster the rate of reaction is likely to be. This is mainly because there will be a larger surface area when using smaller chips, so the hydrochloric acid will be able to react with more of the marble chip than if large chips were used. Diagram: Apparatus: Gas burette, Conical flask, Stopwatch, Water bath, 2 clamp stands, 2 clamps, delivery tube, 1 gram of small, medium or large marble chips for each experiment, 30cm� of HCl 2 mole- for each repeat of each acid concentration, Thistle funnel, Measuring cylinder, Electronic balance Method: 1. ...read more.

Middle

10. After 30 seconds, connect the delivery tube to the bottom of the gas burette. 11. At every 15-second interval, take the reading on the gas burette. 12. Repeat this twice more with large marble chips, and then carry out 3 repeats with medium and small sized marble chips. Results: Large chips Trial 1 Volume (cm�) 3.2 10.1 17.3 25.1 31.1 39.6 50.0 Time (seconds) 15 30 45 60 75 90 105 Trial 2 Volume (cm�) 3.6 10.5 17.1 25.5 31.5 39.4 50.0 Time (seconds) 15 30 45 60 75 90 105 Trial 3 Volume (cm�) 3.4 10.1 17.1 25.6 31.6 39.1 50.0 Time (seconds) 15 30 45 60 75 90 105 Average Volume (cm�) 3.4 10.2 17.2 25.4 31.4 39.4 50.0 Medium chips Trial 1 Volume (cm�) 4.5 12.5 20.1 27.2 35.4 42.1 50.0 Time (seconds) ...read more.

Conclusion

As this is what was predicted early, it shows that the results obtained from the experiment are suitable and appropriate. As readings were taken every 15 seconds, the degree of accuracy may have decreased. However, if recordings were taken every 10 seconds it would make the results more accurate. I have decided to use this time scale in the main experiment. In addition, from the graph, we can see a few anomalous results that may have occurred as a result of human error. These anomalous results have been highlighted, shown by the circled plots on the graph. Although these anomalies have occurred, it is clear that they have not affected in the overall results in a drastic way, as the lines of best fit are still situated as we predicted. For the main experiment, I have decided to vary the acid concentration, but only use medium sized marble chips, as this would have the best rate of reaction to compare. ...read more.

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