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Chemistry Coursework - Marble and Acid Experiment

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Chemistry Coursework Marble and Acid Experiment Aim: To investigate one factor that effects the rate of reaction between marble chips (calcium carbonate) and dilute hydrochloric acid. Marble Chips (calcium carbonate) + Hydrochloric Acid Calcium Chloride + Water + Carbon Dioxide CaCO3 + 2HCl CaCl2 + H2O + CO2 Variables: To alter the rate of reaction between Marble chips and hydrochloric acid, there are a few alterations that could be made. > Pressure- The greater the pressure of a gas the faster a reaction will occur. This is due the fact that there area greater number of particles in a given volume to react. > Temperature- if the temperature was raised the experiment would react faster as the particles would be moving faster with more energy. > Concentration- the concentration of the hydrochloric acid could be lowered by adding different amounts of water. This would slow down the reaction because there are fewer particles in a given volume to react. > Catalyst- these change the rate by providing an alternative reaction pathway along which the reaction can occur. > Surface Area- the surface area of the marble chips can be altered by changing their size. Smaller chips of the same mass will have a larger surface area. A larger surface area speeds up the reaction process, as there is a larger surface area to react at any one time. ...read more.


Experiment Ranges: We shall carry out the experiment 5 times. Using concentration levels of 2 molar down to one molar with integers of 0.4 molar (2, 1.6, 1.2, 0.8, 0.4 Molar). Each one of these experiments will be carried out three times to ensure that we receive true results. An average of the three results will be taken and anomalous results will be ignored. Safety: The hydrochloric acid being used in this experiment can be harmful to humans when mishandled. To protect us from any dangers, lab coats will be worn at all times as well as goggles to protect us from and drops entering our eyes. If any solution is spilt onto us then we must wash our hands immediately as the acid is corrosive and could cause us harm if we fail to do so. Pilot Study: A pilot study took place before the main experiment so that we can adjust our method to receive optimum results. We originally planned to count bubbles but found that this was too tricky, due to their speed, and inaccurate, due to their varying size, and so decided to measure displacement instead. The air travelled through the apparatus at a good speed and effectively Prediction: My prediction is that when the concentration of the acid is higher, the reaction will take place faster. ...read more.


If I hadn't poured or weighed out an exact amount I wouldn't bother to rectify it because I had little time and wanted to finish the experiment in time. My other anomaly is in my first experiment but it is only slightly out I think this is because, I didn't stop the stop watch as instantaneously as I should of done or I lost some Carbon Dioxide at the beginning as I didn't put the stopper on the conical flask as fast as I should have. In future so that I don't get any inaccuracy's I will not rush at the end even if I am running out of time, I will still weigh/pour out the accurate results and if it is not exact the first time I will rectify it until it is. I will make sure my responses are more accurate to putting on stoppers and stopping stopwatches. This experiment is very reliable, the lines of best fit for the repeats are very close, at some points I found the graph quite confusing to plot because they were very close to one another and sometimes over crossed each other. I think that the results I obtained were sufficient enough to draw a firm conclusion because any anomalies, I beleive were caused by experimental errors caused by me. ?? ?? ?? ?? Duncan Fisher ...read more.

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