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An experiment to find out how changing the surface area of the marble chips affects the rate of reaction

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Introduction

Chemistry Coursework An experiment to find out how changing the concentration of acid affects the rate of reaction An experiment to find out how changing the concentration of acid affects the rate of reaction Planning Aim: I am to find out how changing the concentration of the hydrochloric acid (HCL) affects the rate of reaction. The hydrochloric acid will be reacting with marble chips (small, medium, large). During my experiment I will be changing one variable. This will be the concentration of the acid. I will use the concentration of HCL from 0.5 molar/dm3 to 3.0 molar/dm3. I will use 3grams of marble chips for every size of chip. By doing this I will find out if the rate of reaction is quicker or slower using a different concentration of acid. The equation I will be using is: CaCO3 (s) + 2HCl (aq) � CaCl2 (aq) + H20 (l) + CO2 (g) Calcium Hydrochloric Calcium Water Carbon Carbonate Acid Chloride Dioxide Method Firstly I must get the correct equipment and assemble it safely and correctly. ...read more.

Middle

This is because the two types of molecule can only bump into each other at the liquid solid interface, i.e. on the surface of the solid. So the larger the surface area of the solid, the faster the reaction will be. Smaller particles have a bigger surface area than larger particle for the same mass of solid. There is a simple way to see this. Take a loaf of bread and cut it into slices. Each time you cut a new slice, you get an extra surface onto which you can spread butter and jam. The thinner you cut the slices, the more slices you get and so the more butter and jam you can put on them. This is "Bread and Butter Theory". By chewing your food you increase the surface area so that digestion can go faster. The effect of Surface Area - Solid particle size * If a solid reactant or a solid catalyst is broken down into smaller pieces the rate of reaction increases. * The speed increase happens because smaller pieces of the same mass of solid have a greater surface area compared to larger pieces of the solid. ...read more.

Conclusion

From looking at my background information and my knowledge of reactions I predict that the larger the concentration of the marble chips, then the quicker the reaction will be. This happens because there is more of the reactant which comes in contact with the acid causing a quicker reaction. Although I predict that the larger chips will react quickest, I believe that the medium marble chips and a molar of 2.5 will be the quickest and most effective. This is because if I use 3.0 molar acid with large marble chips, the reaction will be too quick to record. Safety I will be using acid during this experiment, therefore I will be wearing safety goggles. I will stand up when doing the test and leave all bags under the table and out of the way. Conclusion I feel my experiment went very well with no major incidents. A few things that I could have changed are: * Taken more care with the water as there were spillages. * Measured out the exact amount of grams of marble chips, because I could not always measure the same amount on every experiment. My results were scientifically correct and matched my prediction. ?? ?? ?? ?? David Holmes 10JB 1 ...read more.

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