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# How the surface area/particle size affects the rate of reaction by measuring the amount of gas produced and weight loss in a reaction between small, medium and large pieces of Marble Chips (Calcium Carbonate) and Hydrochloric

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Introduction

Affect of Particle Size In this investigation, I am going to find out how the surface area/particle size affects the rate of reaction by measuring the amount of gas produced and weight loss in a reaction between small, medium and large pieces of Marble Chips (Calcium Carbonate) and Hydrochloric acid per minute. Hypothesis The rate of reaction increases when the surface area of a solid reactant is increased. This happens because by increasing the surface area we are also increasing the rate of collisions between the particles. When there is more of the reactant to react with the reaction speeds up. Therefore, my hypothesis is that the reaction will be faster when using small chips, so the gas will be produced faster than medium sized chips of calcium carbonate and then large chips of calcium carbonate. Apparatus that will be used: * Conical flask * Cotton wool * Scales * Measuring cylinder (50ml) ...read more.

Middle

The independent variable in my investigation will be the surface area of the Marble Chips, however their mass will need to be controlled as well as the amount of hydrochloric acid and its concentration in all of the tests in order to make it a fair test. The temperature will be kept constant as the room temperature. Analysing the results I made tables to show my results for each size of calcium carbonate chips. Table of results of small chips/powder: Mass of small Calcium Carbonate Chips (g) Time (sec.) Time (minutes) 110 0 0 106.33 30 1/2 106.21 60 1 106.17 90 11/2 106.16 120 2 106.13 150 21/2 106.14 180 3 106.14 240 4 106.12 300 5 106.1 420 7 106.07 540 9 From my table above I can see that for the first minute of the reaction, the mass of the small calcium carbonate chips dropped quite dramatically from 110g to 106.33g. ...read more.

Conclusion

3 109.30 240 4 109.00 300 5 108.50 420 7 108.10 540 9 107.80 660 11 107.30 960 16 107.10 1460 21 From this table, I can see that the reduction of mass of the large calcium carbonate chips is gradual. The total loss of mass of the marble chips over 1460 seconds or 21 minutes was 3.7g, this was very similar to the medium sized calcium carbonate test that I did. This could have been because in this test I used 110cm� of hydrochloric acid and in the other tests, I used only 100cm� of hydrochloric acid. Therefore, my conclusion would be to say that, increasing the surface area increases the chance of the particles hitting the reactant (colliding) and allows more particles to react with the reactant all at once. The bigger the surface area of Calcium Carbonate, the greater the number of collisions. Therefore the rate of the reaction slowed down as the size of the particles was increased from powder to medium sized to large lumps. ?? ?? ?? ?? ...read more.

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