Antacid Analysis and Titration

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Experiment 6: Antacid Analysis and Titration Abstract: The goal of this experiment was to determine the amount of acid that an antacid tablet (in this case, Tums) can neutralize. By allowing the acid and antacid to react with one another, and then determining the amount of remaining, un-neutralized acid by titration, it was possible to determine the ratio of the mass of the antacid to the mass of the acid that was neutralized by the tablet. In this case, the average amount of acid neutralized in the reaction was roughly 57 times the mass of the antacid tablet. Experiment / Observations: The first step of this experiment was to mass, crush, and re-mass a tums tablet supplied in the lab pack. The purpose of massing before and after crushing the tablet was to determine if any of the tablet was lost during the crushing process. After that, 8 mL of 1M hydrochloric acid was added to a 50 mL beaker with the powder from the crushed tums tablet. When the hydrochloric acid was added, a reaction occurred in which the CaCO3 from the tums tablet neutralized the HCL. The solution could be observed fizzing and bubbling heavily for roughly 15-20 seconds, and subsided completely in about one minute. After that, a pH sensitive color indicator, phenolphthalein, was added, and the solution was titrated with 1M sodium hydroxide. The sodium hydroxide was added drop by drop until the solution turned pink, meaning all of the remaining acid that was not neutralized in the reaction with the antacid was now neutralized. The amount of HCl left over from the reaction could be determined by measuring the amount of sodium hydroxide that was needed to neutralize the solution. Since the 1 M sodium hydroxide and the 1 M HCl react with a 1:1 ratio, the amount of sodium hydroxide needed to neutralize the solution was equal to the amount of HCl remaining in the solution after the reaction with

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