lab 8 - Tums. For the first trial it was 40.29% and for the...

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Elizabeth Farrington Discussion Lab #8 To purpose of this lab is to find the percent acetic acid in vinegar from acid-base titration. Also the purpose is to learn the neutralization capacity of antacid tablets. For part II we found the percent acetic acid in vinegar by titrating the vinegar with .3M NaOH until the solution turned from acidic to basic, CH 3 COOH+NaOH→CH 3 COO - +H 2 O then we calculated the percent acetic acid from the amount of base to neutralize it. For the first trial we found the percent acetic acid to be 2.97, and the second trial showed 2.92%. For part III we found the percent active ingredient in a specific antacid, Tums. The active ingredient is CaCO 3 . We added a Tums tablet to 50mL hydrochloric acid. CaCO 3 +2HCl→H 2 CO 3 +CaCl 2 We titrated the acidic antacid by adding .3M NaOH until the solution turned basic. H 2 CO 3 +NaOH→Na 2 CO 3 +H 2 O From the amount of NaOH added we calculated the percent composition of the CaCO 3 in
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Unformatted text preview: Tums. For the first trial it was 40.29% and for the second it was 37.65%. I learned to find the percent composition of acetic acid in vinegar and of calcium carbonate in Tums. I mastered my ability to do acid-base titrations. One error for part III might be using different scales that were calibrated differently; the different weights for the antacid tablets would cause percentages that couldnt be related. Another error would be a misjudgment of colors, causing the amount needed to titrate to be off, thus causing the overall percents to be incorrect. Another error would be not accurately turning the stop cock and letting too much NaOH out at a time, and going over the needed amount to titrate. This would cause the percent to be too high. In the future I will adjust the stop cock more accurately, remember which scale I used, and get a better opinion of the color of the solution....
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lab 8 - Tums. For the first trial it was 40.29% and for the...

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