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Investigating the Factors that affect the rate of the reaction of marble in hydrochloric acid.

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Introduction

Investigating the Factors that affect the rate of the reaction of marble in hydrochloric acid. Theory Prediction For this investigation, I plan on investigating how the concentration of the hydrochloric acid, affects its rate of reaction with marble. I predict that as the concentration of the hydrochloric acid increases, the rate of the reaction will increase as well, so therefore, the more concentrated the acid, the faster the reaction will become. I am basing my prediction for this reaction on the collision theory, and according to this theory, an increase in reactant concentration leads to an increase in reaction rate, and a higher concentration means a larger number of particles in a given volume. If there are more particles, there will be more collisions. More collisions means a larger number of successful collisions. Therefore the reaction rate will increase. In solutions of higher concentration, and in gases at higher pressure, particles are closer together. They have a greater chance of colliding and because there are more collisions, the reaction rate is greater. Prediction of results I predict to get a set of results that will follow this pattern, (while using approximately 3g of marble): Molarity of hydrochloric acid Volume of Hydrochloric acid, (cm3) ...read more.

Middle

and (time in seconds) 10 20 30 40 50 60 70 80 90 100 0 0 0 0 0 0 0 0 0 0 0 1.5 1 3 5 7 9 12 14 17 19 23 2 2 5 8 13 17 21 26 29 33 36 2.5 3 6 12 19 25 31 35 40 46 50 3 4 10 20 27 33 41 47 53 60 65 3.5 5 12 22 30 41 49 55 63 68 77 4 6 15 24 35 45 53 63 70 78 85 Experiment 2 Molarity of hydrochloric acid Volume of Hydrochloric acid, (cm3) and (time in seconds) 10 20 30 40 50 60 70 80 90 100 0 0 0 0 0 0 0 0 0 0 0 1.5 1 3 5 7 10 13 15 18 21 25 2 2 5 10 14 18 23 27 31 35 37 2.5 3 9 15 20 27 32 38 43 45 51 3 4 10 17 25 31 39 46 52 58 63 3.5 5 12 22 30 41 49 55 63 68 77 4 7 16 25 36 44 52 64 72 80 87 Average Results Molarity of hydrochloric acid Volume of Hydrochloric acid, (cm3) ...read more.

Conclusion

My results although not very accurate, can still be used to support my predictions, and the collision theory. The aim of this experiment was: To investigate how and whether the concentration of the hydrochloric acid, affects its rate of reaction with marble (calcium carbonate) Due to this investigation, I can conclude that: the rate of the reaction of marble with hydrochloric acid is affected by the concentration of the acid, and this is because, as I have proven in this investigation, the more concentrated the acid, the faster the marble reacts, and the faster a gas is produced (carbon dioxide). If I had a chance to re-do this experiment, I would not change my procedure or plan completely, but I will add to it by regulating the temperature, and if that proves to difficult, I will aim to complete the experiment in 1 day, in order to have approximately the same temperature, throughout the experiment. I will then try to use a standard size of marble, because it will be too difficult finding out the surface area of the chip, and instead of measuring the amount of gas produced every 10 seconds, I will make the experiment easier and less complicated, by measuring how long it takes to produce a particular amount of gas, with different concentrations of acid. ...read more.

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