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Brandon Comiskey-Lucero Raymond Chem121L Sec 8 December 3 2018 Determination of the Percentage of Oxygen in Air This experiment is very straightforward, and like the title states, our main focus is to determine the percentage of oxygen in the air we breathe. To do this we went through a process of oxidizing two trials of steel wool and then taking weights and measurements that we can use to determine the information needed in this experiment. Introduction In this experiment, we focused on determining the percentage of oxygen in the air. To do this we set up a series of tests. Basically we enabled the oxidation of two different samples of steel wool throughout two different trials. Through doing this there is a series of steps we are able to take to reach our calculations. In the process there are many valuable calculations to go through. Experimental Data To begin this experiment first we had to obtain our two pieces of steel wool, for our two separate trials. We were instructed to obtain two pieces that we about 50 grams.
Our two pieces weighed 0.53 grams and 0.54 grams. Now, we had to go through the process of cleaning the surface of our samples of steel wool. We obtained three beakers filling one with Acetone, another with 1M Acetic Acid, and another with 0.1M Acetic Acid. We dunked the samples in the Acetone first, in order to remove any oil that may be on the surface. Next we soaked the samples in the 1M Acetic Acid to remove any additional oxide coating. Finally we used the bath of the 0.1M Acetic Acid to provide the solution that will catalyze the oxidation.

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