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An experiment to show Calcium Carbonate reacting with Hydrochloric Acid.

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Introduction

Analysis An experiment to show Calcium Carbonate reacting with Hydrochloric Acid I drew 8 graphs, Graph 1 shows the volume of oxygen collected against time for all 6 concentrations (0.2, 0.5, 1, 1.2, 1.5 and 2.0) it shows how the rate is directionally proportional to the concentration, so as the rate doubles so does the concentration. I have also drawn out 6 separate graphs for each concentration. CaCO� (s) + 2HCl (aq) --> CO2 (g) + H20 (l) + CaCl2 (aq) In order for the Calcium Carbonate and Hydrochloric acid particles to react with each other, they must collide with each other and the collision must have enough energy to do so. Collision theory basically means that the more collisions that occur, the faster the rate of reaction will be. ...read more.

Middle

The results I got for this were: Initial Rate Table Concentration of acid Mol/dm� Initial Rate cm�/sec 0.2 0.18 0.5 0.37 1 0.75 1.2 1.02 1.5 1.08 2 1.50 To make the experiment more accurate I could have used a divided flask (diagram below). This would make it much easier to record as the bung would already be on and the acid and limestone chips could be mixed quickly and safely. I could also have recorded data every 10seconds, so I had more results and would therefore be able to see a pattern easier. Another thing I could have done is had a larger range of concentrations, I think 8 would have been a better number to have as it would be better to see a trend. ...read more.

Conclusion

Some of this may be due to a change in temperature, this could be prevented by using a water bath. This is when you put the flask which will have the hydrochloric acid and limestone chips in, in a beaker with water in. the water will be at a set temperature, say 20�C. This will be kept the same for each experiment. (See diagram overleaf ) Most points were close to the line. On the initial rate graph ( graph 8) there was a positive correlation. This means that the Rate of reaction is directly proportional to the concentration of the acid. I think one of the reasons the results had no anomalies is that all the experiments were conducted on the same day, which means they should all have been done at the same temperature. ...read more.

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