Experiment 2 Acetic Acid Content of Vinegar by Julia...

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Experiment 2 Acetic Acid Content of Vinegar by Julia Mitchell Chem 112-19 Amos Dwamena October 6 th , 2016 Jordan Thompson The percent acetic acid of household vinegar was determined volumetrically by an acid-base titration. The mean percent acetic acid in household vinegar was found to be 5.26 .23% compared to the known value of 5%. This results in a 5.2% error. The experimental range does not contain the known value. Variance can be accounted for due to differing samples, calibration errors, or inaccurate measurements.
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PROCEDURE: Hirko, R. Chemistry 112L General I Laboratory, Ninth Edition; bluedoor: Minnetonka, MN, 2015; Experiment 2. RESULTS: The percent acetic acid in vinegar from 2 trials are summarized in Table 1. Figure 1 shows the titration of a weak acid and a strong base. The pH levels throughout were monitored with the gradual additions of NaOH to the solution. There was a jump in the level of pH at 15 ml from approximately 7 to 12. The molarity of household vinegar was calculated using equation 1.
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