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Investigation on the rate of reaction between marble chips (calcium carbonate) and dilute hydrochloric acid.

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Introduction

Investigation on the rate of reaction between marble chips (calcium carbonate) and dilute hydrochloric acid CaCO2+2HCl CaCl2+H2O+CO2 Calcium Carbonate + Hydrochloric acid Calcium chloride + water + Carbon dioxide There are many different factors that can affect the rate of a reaction but I am only explaining three of them; to change the rate of reaction there are variables, they are shown here: 1) Temperature 2) surface area 3) concentration Temperature involves heating up a beaker of acid to the exact temperature and adding the marble chips, whilst putting on the bung and starting the timer. The higher the temperature the more energy each particle will have which means it will vibrate more, causing the amount of collisions to increase. If the particles collide more, the rate of reaction is increased. I thought this was a hard experiment to do because to handle hot acid and start the timer and add marble chips as well as putting the bung on requires a great amount of skill. I think it would be rather dangerous. Surface area involves measuring out the different surface areas of marble chips or powder, adding them to the acid, starting the timer and putting the bung on. The increase in surface area will result in a faster reaction. ...read more.

Middle

8. The above steps are repeated for each concentration of acid. Then the whole investigation is repeated for accuracy. Test for CO2 : lime water goes cloudy Rough trial Using the method above the following rough trials were carried out so as to determine the best range of concentration. For these rough trials I decided to use 15cm3 of liquid in total. Amount of acid (cm3) % of acid Amount of water (cm3) % of water Time taken (s) 15 100% 0 0% 1:1140 5 10 5:1025 From these results, I decided to keep the total liquid the same as the trail and use concentrations from 15cm3 to 5cm3 any lower and it would take to long. I will time how long it takes to fill a whole test tube full of carbon dioxide gas and will record the results. To make my results as reliable as possible I will repeat them as many times as possible and find the average. For safety: * Goggles will be worn at all times * Acid is kept away from skin and eyes if possible. If it comes in contact with eyes or skin it will be washed thoroughly. * An overall will be worn. * A first aid kit will be in the class room Predictions I predict that the higher the concentration of acid, the shorter time taken to fill a test tube with carbon dioxide, and therefore a larger and faster rate of reaction. ...read more.

Conclusion

* If there was and odd results (which there wasn't I could have redone them to make sure it wasn't a mistake. * I have tried to record my results neatly and easy to read. Evaluating my evidence Comment on the produced results I think my experiment went very well. All the results where planned out nicely on the graph making it very easy to read. From looking at my results there was no major error but I repeated the set below: 3 10 5 1:58 2:09 2:03 This is because the second set of results is not very close to the first set. When it was repeated it came out almost the same so i decided to leave the results as they were. There might have been a temperature change or I could have used a different acid. The method was easy and practical. It was very easy to follow and produced nice results. To improve it you could have had the concentrations all ready made up for you so everybody's measuring was the same or you could have had two people doing it so that the timing was correct as it was hard to put on the bung, add the marble chips and start the timer all at once. If you had wanted further evidence I could have had a wider range of tests and I could have repeated them more times but over all the experiment was very conclusive. Lauren ***** U4X 1 ...read more.

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