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To investigate the rate of reaction I have decided to use this experiment. I am going to use Marble Chips and Hydrochloric Acid.

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Chemistry AT1 - Rates of Reaction To investigate the rate of reaction I have decided to use this experiment. I am going to use Marble Chips and Hydrochloric Acid. I will change the concentration of the hydrochloric acid each time, and I will measure how quickly the upturned measuring tube will be filled up with carbon dioxide. Prediction I think that the higher the concentration of hydrochloric acid the faster the carbon dioxide will be given off. I think this because the higher the concentration of acid molecules the more particles available to react. Also the higher the concentration of acid particles the more chance of a particle having enough activation energy. The more particles available at any one time with enough activation energy means that in a given time more of the product is produced, or it takes a less amount of time to produce a certain amount of product, in this case Carbon Dioxide. The activation energy is the amount of energy needed to make the two particles react. ...read more.


Weigh out 10 grams of the marble chips; use the same weight each time for each of the molarities. Place the chips into the conical flask and insert the bung. As the reaction takes place bubbles should start to come out of the delivery tube into the upturned measuring cylinder. From the first bubble measure how long it takes for the upturned measuring tube to fill up with gas. Record the result and refill the upturned measuring cylinder with water, wash out the conical flask and weigh out the next lot of marble chips. Repeat the experiment but each time using a different concentration of acid 0.5M more each time until you get to 2M and as you will need 5 different concentrations you can do 1.25M or 1.75M acid aswell. You may want to repeat the experiment three times to get a more accurate average for each concentration. Fair Test - Controlling the Variables * What I will keep the same - Each time I repeat the experiment I will keep the temperature, surface area of the marble chips, amount of acid used and the amount of carbon dioxide to be collected the same. ...read more.


If my results had been more accurate I think the results would show the concentration of the acid and the rate of reaction to be proportional. The graph also supports my prediction. On the graph, the steeper the curve, the faster the rate of reaction. Evaluation Overall I am pleased with my results and the way the experiment was carried out. I think my results were fairly accurate and proved my hypothesis. To make the overall experiment results more accurate we repeated it three times and then took the average. If I were to do this experiment again I would probably make it more accurate by using smaller particles of marble chip so I could match up surface area and weight more accurately each time. I would like to then see if the concentration of acid is proportional to the rate of the reaction. Some other areas in the experiment that I feel I could have improved on were factors like, controlling the stopwatch. There is a lot of human error here. But the inaccuracies due to them were minor because I paid close attention to these during the experiment. ...read more.

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