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How acid rain affects limestone buildings.

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Introduction

David Pollard 11MB/11y2 Acid Rain & Limestone Investigation Introduction - In this investigation we are going to be looking at how acid rain affects limestone buildings. E.g. York Minster Causes of Acid Rain Acid rain is causes by the pollution released from power stations when they burn fossil fuels. The power station emits clouds of sulphur dioxide and nitrogen oxides into the air. In the air chemical reactions happen and when it rains, the water drops down into the rivers and earth. This effects trees and buildings, water chemistry and biology etc. Purpose of the Investigation The purpose of this investigation is to see if more fossil fuels were burnt how much time would it take to corrode the limestone building with acid rain. Plan I am trying to prove that the more concentrated the Acid Rain is the less time it will take to react. Calcium + Hydrochloric --> Calcium + Carbon Dioxide + Water Carbonate Acid Chloride (CO2) ...read more.

Middle

into the boiling tube. I am going to get 3 results for every experiment. Results 1st Test - 12cm� of Acid, No Distilled Water Volume Of Gas (cm�) Time (sec) 1 2 3 Average (cm�) 0 0 0 0 0 15 55 54 55 54 30 92 92 96 93 45 - - - - - 60 - - - This shows that the experiment ended very quickly. It only took 30seconds for all the gas to empty out of the measuring cylinder. 2nd Test - 10cm� of Acid, 2cm� of Distilled Water Volume Of Gas (cm�) Time (sec) 1 2 3 Average (cm�) 0 0 0 0 0 15 33 35 39 35 30 69 69 69 69 45 92 93 91 92 60 This shows that the experiment took 45 seconds to empty the measuring cylinder. 3rd Test - 8cm� of Acid, 4cm� of Distilled Water Volume Of Gas (cm�) ...read more.

Conclusion

Evaluation My results clearly show that all the things I have mentioned in the conclusion were about right. My results did show that the more acid the faster the reaction. I could see this because looking at my results they show that with less acid and more water the more time it takes for the reaction to end The results of experiments1 to 5 were all a little different. Experiments 1 2 & 3 all ended after about 45 seconds. But 4 & 5 took 120seconds to end. Experiments 1 and 5's 3rd test is very different to the 1st two. They show bigger volumes of gas, but the 1st and 2nd are quite close together. This may have occurred because the experiment wasn't done all at the same time, or was done with less accuracy. I could have made the test more accurate and avoided the anomalous by doing all the experiments at the same time to avoid things changing and try to find a better way of measuring the Acid and Distilled Water more accurately. ...read more.

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