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# Study the factors which effect the rate of reaction between Calcium Carbonate (marble chips) and Hydrochloric acid

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Introduction

Study the factors which effect the rate of reaction between Calcium Carbonate (marble chips) and Hydrochloric acid Chemical equations: Calcium carbonate + hydrochloric acid ? Calcium chloride + carbon dioxide + Water CaCO3 (s) + 2HCL (aq) ? CaCl2 (aq) + CO2 (g) + H20 (g) Choice of method In our experiment the chemicals we are using will give off a gas so we can collect this in order to record our results. Variables I am going to vary the temperature of the solution each time. Controlled I am going to keep the concentration, size of marble chips, amount of solution and time left to react constant though out the whole experiment. Scientific Knowledge The concentration of a solution changes the results you will get. This is because if the concentration is increased then there will be more reactant particles present and thus create more collisions and therefore will create more successful collisions. This will give you a faster reaction. If you decrease the concentration of a solution then the reaction will become slower because there will be less particles to create successful collisions. The temperature also affects the reaction results. If it is raised then the particles energy is increased which results in them moving around faster so they will collide more often and will have more successful collisions and therefore take a shorter amount of time. ...read more.

Middle

to the temperature you need to record the results for. In my case it will be 30 degrees. Results table: Temperature = ? Degrees (Cm3) Volume Time (sec's) Repeat 1 Repeat 2 Average 20 40 60 80 100 120 140 160 180 200 This should be recorded at every temperature and should be repeated twice for accuracy. Also you will then be able to average the results for each temperature. Graph: For each set of results a graph should be plotted and a line of best fit should be used on each temperature. Safety: 1. Wear safety goggles at all times 2. Keep acid away from skin and clothing 3. make a clear work space 4. never leave your experiment unattended 5. tie hair back 6. Light Bunsen on blue flame Analysis Trends: � In all experiments as the temperature went up the rate of reaction increased. � As the temperature went up so did the amount of collisions � As the amount of collisions went up so did the amount of successful ones. � As the temperature went up the quicker it reached activation energy. � Time is directly proportional to the volume. Conclusion The quicker the temperature went up the more speedily the reaction occurred. Sometimes in the results and graphs I received slightly odd results that did not fit in with the rest of the pattern. ...read more.

Conclusion

� Also the room temperature experiment was effect as when I did the first result and first repeat it was warmer in the room than when I did the second repeat the next day. This could be improved if I could have had more time to complete the experiment. Further work Further investigating of the factor which affects the rate of reaction of marble chips and hydrochloric acid could be concentration. If we had kept temperature and all other factors constant except concentration we would have been able to see what effects it would have had to the rate of the reaction. You could use the exact same apparatus as in the previous experiment for temperature except you would not need a Bunsen but you would need about five different concentrations. They would need to go up by 0.2 each time so you could see a clear difference in results and follow the path of them easily. Also I could make a prediction using my knowledge from the previous experiment on temperature that the more concentrated the solution became the quicker the rate of reaction. This is because the more concentrated the solution is the more particles it will contain and the more particles it contains will give a higher chance of them colliding. This will result in more successful collisions which would speed up the reaction. ...read more.

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