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Exp. 2 Report - EXPERIMENT 2 Sampling in Analytical...

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EXPERIMENT 2 Sampling in Analytical Chemistry Jennie Senter Locker H-10 2/6/08 Experiment Performed 1/30/08
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With the “bottle cap” data, the experimental results are relatively close to what is expected using the theoretical relative standard deviation, with a difference of 0.012. With the “weighing bottle” data, the experimental results are not nearly as close to the expected results compared to the “bottle cap” data, with the difference being 0.133. With the “50 mL beaker” data, the experimental results are also not close to the expected results, with a 0.101 difference. With the exception of the “weighing bottle” data, the experimental results vary greatly from the expected results. These results are using 3 trials. With repeated trials, the experimental data should fit more closely with the theoretical results. For this experiment, we can look at the entire class’ data to test this theory. For the “bottle cap” data, there is a large variation between the experimental and theoretical results with a difference of 0.103. For the “weighing bottle” data, there is a much smaller difference between the experimental and theoretical results, with a difference of 0.02. And for the “50 mL beaker” data, the experimental and theoretical results are identical. This proves the theory above; that, in general, the predicted trend is clearer when a large number of measurements are included. The red beads represent a heavy metal poison, harmful at concentrations higher than 0.10. If one were to look at the average red bead concentration alone, all three samples show harmful levels. However, with the two smaller sample sizes, the
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