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Investigation into the effect of Concentration on Rate of Reaction

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Introduction

Investigation into the effect of Concentration on Rate of Reaction Planning In this experiment, my aim is to investigate the rate of reaction time it takes for me to get 15ml of CO2 from reacting different amounts of hydrochloric acid with marble chips. I will be investigating the time differences with different amounts of acid and water. I will be collecting 15ml of CO2. I have planned a fair and safe test because without a fair test, I would get inaccurate results which would make the experiment pointless. Safety is a big factor in experiments and I will ensure I behave sensibly and wear safety glasses to protect from any spills with the acid. I will change the acid/water 4 times so I will end up with 5 results for each test. I will need the following equipment:- 1) Conical Flask 2) Delivery tube + Bung 3) 2 measuring Cylinders 4) 1 basin half full of water 5) Stop Clock 6) Hydrochloric Acid 7) Marble chips 8) Water and acid This is the word and chemical equation for my experiment Calcium Carbonate + Hydrochloric Acid >>>> Calcium Chloride + Water + Carbon Dioxide CaCO3 + Hcl >>>>>> CaCl2 + H20 + CO2 (Solid) ...read more.

Middle

Therefore, I will have to be consistent in choosing marble chips which are identical throughout the experiment IF my results do not match my prediction which, is backed up with scientific knowledge, I will share results with others to see where I may have gone wrong. I will repeat the experiment once and then use both sets of results for averages. Before I started my experiment, I did a practice run to get a feel of what I would be doing in my real experiment. I found that the more acid present, the quicker the reaction. This has helped me to plan my prediction because I now know what to expect for the final outcome. Obtaining I performed a safe test with no problems or accidents occurring. I collected 2 sets of results which I put into a table. I tested 6 different concentrations and I have 2 results for each concentration. Here are my results for the 6 different concentrations:- Water/Acid 0/50ml 10/40ml 20/30ml 30/20ml 40/10ml 50/0ml 18 seconds 36 seconds 52 seconds 66 seconds 77 seconds 99 seconds 22 seconds 34 seconds 59 seconds 70 seconds 80 seconds 102 seconds 20 seconds 35 seconds 55.5 seconds 68 seconds 78.5 seconds 100.5seconds The first row represents the water/acid measurements. ...read more.

Conclusion

I believe the evidence I collected was accurate and as best as I could. As I stated before, there were no results that stood out in my tables which show my accuracy in this experiment. I believe my careful and planned method was responsible for these accurate results and I think I have investigated the question quite well. However, if I had the chance, I would have maybe added more results to my method, i.e. maybe seeing how long it would take with 80ml, 100ml and even 150ml of acid. In doing this, it would have given me a wider set of results but I believe my 5 separate results were sufficient to support my prediction. I think my results support my conclusion because they both state that as I add more acid, the rate of reaction quickens. My results are reliable and I received no anomalous results. I believe this reflects on the effort I put into the investigation. One interesting thing that I noticed was that as the reaction started Hydrochloric Acid near the chips would have been depleting which means that the concentration of the acid around the chips would be less than average. One way of solving this would be to constantly stir the acid around covering the chip with new acid all the time. ...read more.

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