Lab1_write-up - Experiment 1: Physical Measurements and...

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Experiment 1: Physical Measurements and Stoichiometry Michael Butler Georgia Tech Honor Challenge I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community. Date Submitted: 5/26/10 Lab Partner: Shivani Shah Lab Section/TA: 1312 A2/Lisa Vaughan
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Discussion/Conclusion: The experiment was designed to review stoichiometry, introduce common statistical methods for analyzing data, conduct a simple inorganic synthesis, and review accuracy and precision in a lab. In part A-1, the weights of supposedly identical washers galvanized with zinc were recorded; one washer, the master washer, was weighed on five separate balances to compare the average to the true value of the provided washers, which is 5.2 g, and its dimensions were also taken (total radius 25.5 mm, inner radius 11.5 mm, height 1.5 mm). The percent error for the master washer, which had an average mass of 5.196 g, was 0.08% [A-1], and the standard deviation was 0.009; thus, the balances were accurate and precise, because the masses were close and the total average was close to the true mass of a washer. Five washers were weighed on the same balance, which produced an average value of 5.361 g and a standard deviation of 0.151, which is not as precise as the master washer but still fairly precise. As a result, weighing one washer on five different balances is more accurate and precise than weighing five washers on one balance [A-1]. Next, the master washer was placed in a 3 M solution of HCl until the reaction completed, in order remove the zinc coating from the washer. If the washer was removed before the reaction went to completion, the corresponding zinc thickness calculations would yield a result smaller than desired, because the amount of removed zinc would be less than the actual value of the completed reaction [A-2]. Once the reaction was completed, the mass of the master washer was recorded (5.177 g), which revealed
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Lab1_write-up - Experiment 1: Physical Measurements and...

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