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Rates of Reaction

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Introduction

Rates of Reaction Coursework Experiment to see how the Concentration of Acid Changes the Rate of Reaction Plan In this practical I am going to add marble chips, a form of calcium carbonate, to hydrochloric acid and collect the gas produced into a gas syringe. Then I am going to change the concentration of the acid and see how the rate of the reaction changes as a consequence of this. The reaction that is going to take place is the one below: Calcium Carbonate + Hydrochloric Acid ( Calcium Carbonate + Water + Carbon Dioxide CaCO3 (s) + HCl (aq) ( CaCl2 (aq) + H2O (l) + CO2 (g) The gas produced is carbon dioxide. The fastest reaction will be the one which takes the least time to fill up the gas syringe. The apparatus are shown below in the positions that they will be used: The rate of reaction will dependant on the number of collisions and particles that take place. The particles have to collide with each other at an energy equal or greater to the activation energy. ...read more.

Middle

7. I will repeat the steps above, but differ the acid concentrations. If the gas syringe doesn't move that well for the lower concentrations, I will tap the barrel to stop the plunger sticking. 8. When I have repeated the experiment for all the acid concentrations, I will draw a graph of Volume of CO2 in cm3 on the Y-axis and the time in seconds on the X-axis. The table of the concentration of acid is below: Mixture Volume of 2 mol dm-3 acid/ cm3 Volume of Water/ cm3 1 50 0 2 40 10 3 30 20 4 25 25 5 20 30 I will do each of the concentrations twice and then take an average of the readings I get to make sure that the results are reliable. I will use an excess of the marble chips so that the surface area won't decrease too much during the reaction, this is because I only want one variable and if there's too much acid the surface area might decrease, as this will slow down the rate of reaction. ...read more.

Conclusion

These results are the highest and lowest concentration from my preliminary experiment and these helped me make the prediction for the graph: Strongest Acid Concentration Time/s 5 10 15 20 25 30 38 Volume of CO2/cm3 17 23 37 44 60 82 100 Weakest Acid Concentration: Time 5 10 15 20 25 30 117 Volume of CO2/cm3 8 15 24 33 56 65 100 Obtaining Evidence These are the results I obtained: Acid Concentration 1 Time in seconds 10 20 30 32 Amount of gas collected (cm3) 25 60 85 100 Acid Concentration 2 Time in seconds 10 20 30 34 Amount of gas collected (cm3) 20 50 85 100 Acid Concentration 3 Time in Seconds 10 20 30 40 50 54 Amount of gas collected (cm3) 10 25 50 75 90 100 Acid Concentration 4 Time in seconds 10 20 30 40 50 60 70 71 Amount of gas collected (cm3) 7 18 29 44 65 83 94 100 Acid Concentration 5 Time in seconds 10 20 30 40 50 60 70 80 90 100 110 111 Amount of gas collected (cm3) 4 9 16 23 30 38 53 62 80 86 94 100 ...read more.

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