chem 17.docx - Post Lab 17 Questions 1 The equivalence...

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Post Lab 17 Questions 1. The equivalence point for the first titration, with HCl, is less than the phenolphthalein endpoint. If you had determined the equivalence point by the phenolphthalein color change, the calculated value of the HCl solution would be a little smaller because only a tiny amount of liquid, roughly 0.20 mL, was added between the equivalence point and the phenolphthalein endpoint. In other words, when comparing the endpoint reached by the electrode and the endpoint reached by the phenolphthalein indicator, the results indicate that the pH of the endpoint reached with the electrode is less than the pH of the endpoint reached by the phenolphthalein indicator, and that the pH of the equivalence point reached with the electrode is a little smaller than the pH reached by the phenolphthalein indicator. Furthermore, when the pH is smaller, the concentration of HCl is larger, as the NaOH neutralizes less HCl. 2. Because K a = [H 3 O + ] 1/2 , values of pH that are erroneously high or low will affect the
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