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Rates of Reaction Coursework.

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Rates of Reaction Coursework Plan During this investigation I am going to add dilute hydrochloric acid to calcium carbonate (powder), but vary the volume of acid. I am also going to collect the amount of gas given off, and to record the results (time) it takes for the gas to finally disappear. After every 10 seconds, I am going to record how much gas is given off, by recording the water level, from the measuring cylinder. To make sure the investigation is a success, I am intending to vary the amount of dilute hydrochloric acid being used, for example, using the concentration of 1 Molar then 0.8 Molar. I am also going to vary the volume of Hydrochloric acid and the volume of water used. Grid below explains in further detail: Concentration/M Volume of HCl/cm3 Volume of water/cm3 1 50 0 0.8 40 10 0.6 30 20 0.4 20 30 0.2 10 40 I am also going to measure approximately 3 grams of Calcium powder, for every experiment trail and for every varied concentration. Prediction I think that during the experiment, the less concentrated the dilute hydrochloric acid is the longer it will take for the reaction to take place. ...read more.


into a small measuring flask. Then we had to fill a box with water, which was able to fill up a large measuring flask. The measuring flask was then tipped over into the box, full of water so that no water was escaping. We then, added the calcium carbonate (powder), used the thistle funnel, plugged it onto the conical flask and ensured that the rubber part was tightly pushed down. We then were ready to add the last ingredient, which was the hydrochloric acid. With the stop clock in our hands we indicated when it was suitable to start. Once the hydrochloric acid made contact with the powder, we immediately started the timer. After every 10 seconds we counted how much gas was given off, and looked at the measuring flask to see the amount of water left. Fair Test To make sure the experiment was as fair as possible I had to repeat it at least 3 times in order to make sure everything was okay. I am also going to make sure that it is fair by getting an average, which was adding all the times, and dividing them by the number of results. ...read more.


When I decided to add the Calcium carbonate powder some of it was sticking to the bottom of the flask because the flask was wet. If I was to the experiment again, I would make sure that I clean the flask properly, ensuring that the powder wouldn't stick. Also the small rubber tube from the thistle funnel wasn't straight at all times and wasn't touching the flask. Since it wasn't straight this resulted in no reaction taken place, making our results not being fair. To make sure that this problem was resolved we had to make sure that the rubber tube was kind of bent, and that it made contact with the flask. The process of adding the powder into the flask may have been a difficulty since all the powder (3 grams) didn't actually enter the flask, which varied my reading. The conditions of different days may have also differed my reading, since it may have been hot one day, and cold the other. If I was to the do the whole experiment again, I will ensure that I try to do everything in 1 day, and to use the same amount of hydrochloric acid, since the acid may have been different from time to time. Overall the experiment was okay, but the readings may have been different because of the problems we encountered. ?? ?? ?? ?? 08/05/2007 ...read more.

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