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An Investigation into the rate of reaction between Hydrochloric acid and Marble Chips (Limestone).

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Introduction This is an investigation to see what happens to the rate of reaction when you put different concentrations of Hydrochloric acid into a conical flask with Marble chips of the same mass. A rate of reaction is how quickly the two or more substances chemically combine. We measured the carbon dioxide in the measuring cylinder that is in the ice cream tub because we kept that the same so we could do the calculation for a rate of reaction. You can find this by doing a calculation: the change in the substance you are measuring divided by the time taken to get that change. The word equation for the experiment we did was: Calcium Carbonate + Hydrochloric acid. The products were Calcium Chloride, Carbon Dioxide, and Water. Sometimes we write the chemical equation because it is easier at any place or time and the equation for our experiment is: CaCo3 + 2Hcl = CaCl + Co2 + H2O Fair Test We are going to make this a fair test by keeping the same mass of marble chips, the same measuring cylinder, the same conical flask, the same amount of concentrations each time, the same amount of change in ...read more.


Scientific Knowledge My theoretical explanation is that there are more particles in the same volume of a concentrated solution so there are more collisions. More collisions mean a faster rate of reaction. If the concentration doubles the number of collisions double and so the reaction rate doubles as well. If the concentration was 0.4 and there were 16 collisions and the rate of reaction was 0.5, then the concentration was 0.8 and there were 32 collisions so the reaction rate would be 1. This would prove the scientific knowledge that I have gained. Apparatus The equipment that we are going to use are as follows: - a stopwatch, a conical flask, two measuring cylinders, an ice cream tub, a bung, a clamp stand, 5grams of marble chips, 150ml of Hydrochloric acid and an ice cream tub full of water (up to outer bit). Method 1. Collect the equipment as mentioned above. 2. Put the 5grams of marble chips in the conical flask. 3. Put the measuring cylinder full of water in the ice cream tub full of water upside down. ...read more.


I believe that the results agree with my prediction. Evaluation I did have some anonymous results even though I did everything that the method told me in the right order but I did not have an explanation for these results. I think that my results are good overall because they prove what I predicted and that means that the rate of reaction increases when the concentration increases. In my opinion, we could not make the accuracy of the method any higher because there was no need to make it more accurate. We could of done the measuring of the dilute Hydrochloric acid in intervals of ten but I saw no point in that because it would use up our time. I think that was not the only way of doing our particular investigation but I did not study further into this issue so I do not know any details or facts. Yes I am positive that the results of our experiment are pretty reliable because our preliminary experiments and results show similar patterns. We could extend our investigation by researching other factors that could make our results more reliable but we were not given the time to do that in class where the equipment was. ...read more.

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