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'Investigating how changing concentration affects the rate of reaction between Marble chips and hydrochloric acid.

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Introduction

Planning The title of this investigation is 'Investigating how changing concentration affects the rate of reaction between Marble chips and hydrochloric acid. My aim is to figure out how much concentration affects the rate of marble chips in hydrochloric acid. There are lots of different factors that affect this reaction such as using the same amount of marble chips every time and using the same size eg. Small, medium or large. You need to make sure that the lid (stopper, bung) is completely on, as gas can escape if the lid is not fitted properly. The syringe should always be at 0 to start, so you don't get the wrong results. The temperature can affect how fast the marble chips work and may also give you the wrong results. ...read more.

Middle

Putting all bags and coats under tables - you could slip over while carrying marble chips, glass ware or acids Washing hands if there was a spillage of acid Always check the syringe is not coming out to far - if there was a lot of CO2 being produced the syringe would move quicker and could shoot out to fast Hold syringe properly - hold tube and outer tube Wipe up ALL spillages Method Firstly, we weighed out 5g of small marble chips; we then added them to 20cm3 hydrochloric acid in a side armed conical. This conical was connected to the gas syringe and as soon as the marble chips were added to the hydrochloric acid, we started the stopwatch and from the on we took the reading of the volume in the gas syringe when a certain point is reached. ...read more.

Conclusion

This could have been caused by the bung was not in properly. Evaluation My personal opinion of how this experiment went is that is gone very well. I think that a few minor mistakes were made, but the experiment still went well, and our results have come up quite well. I think on some occasions we may have misread the reading and this could have given an anomalous result. Errors could have also occurred if weighing the wrong amount of marble chips or measuring the wrong amount of hydrochloric acid - this could have had a major affect on the results. If I were to do this experiment again, I would use the same syringe so the results could have been higher than 50. To conclude my investigation I think the experiment went well and we were accurate with our method. Lauren Ardolino 10AH ...read more.

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