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Chemistry Equilibrium Lab

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Introduction

Chemistry Equilibrium Lab Data Collection Table 1. Reaching equilibrium in 10mL of water in cylinder A and B with the same radius straw with 10mL of water Number of Transfers Volume of Water in a cylinder A (mL � 0.1 mL) Volume of Water in a cylinder B (mL � 0.1 mL) 0 10.0 0.0 1 9.8 0.2 2 9.6 0.4 3 9.4 0.5 4 9.2 0.8 5 9.0 0.9 6 8.9 1.0 7 8.6 1.3 8 8.4 1.4 9 8.2 1.7 10 8.0 1.8 11 7.8 2.0 12 7.6 2.2 13 7.4 2.5 14 7.2 2.6 15 7.0 2.8 16 6.8 3.0 17 6.6 3.2 18 6.6 3.2 19 6.6 3.2 20 6.6 3.2 21 6.5 3.4 22 6.2 3.7 23 6.0 3.8 24 5.9 4.0 25 5.6 4.2 26 5.5 4.4 27 5.2 4.6 28 5.2 5.8 29 5.0 5.0 30 5.0 5.0 31 5.0 5.0 32 5.0 5.0 Table 2. Reaching equilibrium in 10mL of water in cylinder A and B with the same radius straw with 5mL of water added to cylinder A after results from Table 1. Number of Transfers Volume of Water in a cylinder A (mL � 0.1 mL) Volume of Water in a cylinder B (mL � 0.1 mL) ...read more.

Middle

In other words, the rate of the forward reaction slows while the rate of the reverse reaction increases until they are at equal rates. After the addition of 5.0 mL in cylinder A, using Le Chatelier's principal it is possible to predict what will happen to the system. If concentration of the forward reaction increases, equilibrium move towards reverse reaction and will correct itself to re-establish equilibrium. There was 10.0 mL of water in the previous reaction and dynamic equilibrium was reached when the volumes were 5.0 mL in each cylinder. When 5.0 mL were added to cylinder A the volume went back to 10mL. We can predict that 15.0mL in total will cause equilibrium to be reached at 7.5mL as the rate of transfer is still the same. When using different radius straws, it is noticeable that the rate of transfer will differ as the thicker straw can hold more water during each transfer. Therefore the volumes in the respective cylinders will be different as the rates of reaction are not the same due to the different straws. This can be seen on Graph 2. The volume in cylinder A decreases as the volume in cylinder B increases. ...read more.

Conclusion

Those ends were also flattening out because of the force that was applied to transfer water. The random errors could affect our results because of inaccurately and slow down the time required to reach equilibrium. Doing the lab on separate days altered the consistency of equipment used for the experiment. The human errors t of the experiment include parallax when reading the values of water on the graduated cylinder which could cause the graph of the experiment to also in inaccurate. In addition, our fingers might not be moist all the time to maximize suction of water in the straws. These errors could increase or decrease the number of transfers needed to reach equilibrium. Improvements Improvements that could be made to this experiment include cleaning out the graduated cylinders beforehand and make sure that there are not any water droplets along the wall of the graduated cylinder so the volume of water would be accurate. We could also moisten our finger after every transfer of water to maximize the suction and volume of water with each transfer. A more careful reading of the graduated cylinder could avoid parallax and imprecise data. More trials of this experiment and doing it in one day could have been done to improve the accuracy of the results. ...read more.

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