exp15 - soda sample We used two methods first the HCl...

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Discussion The clear answer is that the baking soda was not pure. Although, especially on part A, our answers to the percent mass had a wide range, it can still be concluded that the baking soda sample contained impurities. Our answers were not precise, as the two trials of part A yielded such a wide range or possibility, yet the average of these two answers was close to the answer for part B. Thus, I believe they are mostly accurate. The two experiments we conducted did leave room for error. Drops of HCl could’ve escaped into the solution without being counted or we could have miscalculated the final mass of the heated crucible on part B, making it more than .005g difference, which would lead to an incorrect answer. Conclusions The purpose of this experiment was to simply determine the purity of a baking
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Unformatted text preview: soda sample. We used two methods: first, the HCl titration of the baking soda sample to determine its percent by mass and next, the thermal gravimetric analysis of the same sample. These were well designed experiments that definitely yielded the results we were looking for. Given, we were not expecting such a large gap in the two trials of the titration, but with experimental error, this can be expected. It is why we performed two trials. Although the two experiments yielded different numerical values, they did both prove that the baking soda sample was largely impure. Taking the average of the two experiments, the percent by mass of pure baking soda in the sample was 62.06%....
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