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An Investigation Into The Chemical Weathering of Limestone

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Introduction

Joseph Coyle 10J An Investigation Into The Chemical Weathering of Limestone Purpose of experiment: To investigate what the effects of acid rain on limestone are and to discover whether the concentration of the acid affects the rate of reaction of the weathering of the limestone. Plan: We will put hydrochloric acid and limestone into a conical flask, and vary the concentration of the acid to determine if the concentration of the acid affects the rate of reaction of the weathering of the limestone. Pre-trial run: When we carried out our pre-trial run, the experiment was not altogether a success! We carried out this pre-trial run, to see if anything needed to be changed. First of all, we noticed that we were allowing the gas to get out of the measuring cylinder before we called stop. We rectified this by shouting stop at the 25 ml mark on the measuring cylinder during our first trial. During the trials, we measured the limestone to the nearest tenth of a gram. I thought the pre-trial run experiment was crucial to the investigation as it allowed us to find out what measurements to use. ...read more.

Middle

We will also use the same units in each experiment. Changes: The only variable we will change in our experiment is the concentration of the hydrochloric acid, so we can get our results and draw a firm conclusion. Measurements and Trials: In our experiments, we will change the concentration of the acid five times. The measurements will be 100% acid, 80% acid and 20% water, 60% acid and 40% water, 40% acid and 60% water, 20% acid and 80% water. We shall try to do three trials at each different concentration and finally we shall have five sets of results to allow me to plot a graph of averages. By having a lot of results, we will be able to tell whether the result is truly anomalous or correct. If we had only one or two sets of results, it would be hard to tell whether the result was anomalous. Prediction: I predict that the limestone will react quicker in pure acid than in dilute acid. If a reaction was to take place, the reactive particles of the acid and reactive particles of the limestone must collide with each other with a lot of energy. ...read more.

Conclusion

Concentration of acid Volume of Time to measure 25 ml of Carbon Dioxide Gas CO2 (Seconds) Acid ml Water ml Trial 1 Trial 2 Trial 3 Trial 4 Average 100% 50 0 80% 40 10 60% 30 20 40% 20 30 20% 10 40 Diagram: Bubbles of CO2 Gas Delivery Tube Measuring Cylinder Conical Flask Water Hydrochloric Acid Limestone Trough Method: * We set up the apparatus as shown above. * We measured 5 grams of limestone using a spatula. * We placed the limestone into the conical flask. * We poured on the hydrochloric acid and water solution, and then placed the bung in the flask quickly. * When the measuring cylinder was filled with 25ml of gas, we stopped the stopwatch quickly. * We recorded the results and repeated the experiment for the different concentrations. Results: Concentration of acid Volume of Time to measure 25 ml of Carbon Dioxide Gas CO2 (Seconds) Acid ml Water ml Trial 1 Trial 2 Trial 3 Trial 4 Average 100% 50 0 6.00 15.00 24.00 6.52 13 80% 40 10 22.00 25.00 3.77 22.56 23 60% 30 20 21.00 40.00 42.00 21.64 31 40% 20 30 64.00 62.00 60.00 60.00 61 20% 10 40 651.00 498.00 780.00 681.00 652 ...read more.

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