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Experiment to consider a factor that affects the rate of reaction between marble chips and hydrochloric acid.

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Tanya Hughes Experiment to consider a factor that affects the rate of reaction between marble chips and hydrochloric acid. Factor investigated I have chosen to investigate the effect of concentration of acid on the speed of the reaction Calcium Carbonate + Hydrochloric Acid v Calcium Chloride + Carbon Dioxide + Water (Calcium carbonate reacts with the hydrochloric acid to give Calcium Chloride and Hydrogen. Fizzing due to Hydrogen gas is given off.) Preliminary work I carried out a preliminary experiment using a computer simulation programme to give me an idea about what range of concentrations to use in my real experiment. I used a volume of 20cm� hydrochloric acid and a mass of 1.00 grams for the marble chips, varying the concentration of the hydrochloric acid each time. I then repeated the preliminary experiment, using the equipment myself, with a range of different concentrations and masses of marble chips, in order to ensure what range of concentrations and mass of marble chips to use. I put my results into a table, and from it I produced a graph, which enabled me to look at, to give me an idea of what concentrations were reasonable to use. ...read more.


I am doing this, as it will allow me to calculate an average of the three readings, giving me a more accurate result, and later if I need to repeat any experiments I can. An important point is that I must use the right amount of acid and the best-sized amount of marbles. I also need to be accurate when measuring out concentrations especially when measuring out 1.5 and 2.5 as to achieve them concentrations I need to add two concentrations together, making sure I add the exact same amount of each. Plan When doing my experiments I will use the same procedure throughout. I will set out my equipment as shown in the Apparatus section. Throughout the experiment I will be ready with the stopwatch, so that I start and stop it immediately as it is necessary to get accurate readings. Once I have set up the apparatus I will measure out 30 cm� of acid in a measuring cylinder and then pour it into the conical flask. I will then accurately weigh out 3 grams of Calcium Carbonate chips using a top pan balance. I will then quickly place the chips into the acid, insert the bung in the top of the boiling tube and start the stopwatch. ...read more.


* The gas syringe may have got slightly stuck, when Carbon Dioxide (CO ) gas was being produced. - I could have overcome this problem by twisting the gas syringe back and forth before each experiment in hope that the syringe would not get stuck during the experiment, which would affect my results. I think that the procedure I used for my experiment worked quite well. There are no major ways I think I could have improved my experiment as I did not get any major anomolous results, however, if I were to repeat the experiment, I could take more time and care to eliminate sources of error, in order to help me achieve better results. I think that I received enough data to be sure about my conclusion, and also I think that the range of concentrations I finally decided to use in my final experiment were a good range of concentrations. This is because, the results I achieved, produced a reasonably good shaped graph. I do not think that I need to take more readings in between those I have already taken, but if I were to repeat the experiment again, I would use concentrations in between those already used to give me a more accurate outcome. ...read more.

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