How did the concentration of H 3 PO 4 determined from each of the equivalence

How did the concentration of h 3 po 4 determined from

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2. How did the concentration of H3PO4determined from each of the equivalence points compare?
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3. How did the K a values match those listed in your textbook? Explain any difference or similarity. (Explicitly cite your reference) The K a1 that I calculated for H 3 PO 4 is 6.03x10^ -3 and K a2 that I calculated for H 3 PO 4 is 7.6x10^ -8 . The K a1 I found in the book for H 3 PO 4 is 7.5x10^ -3 and the K a2 I found is 6.2x10^ -8 . The Ka’s I calculated from the experiment are fairly close to the actual K a values. The pH for the K a1 listed in the book is 2.1 and the pH for my K a1 is 2.22.The pH for the K a2 listed in the book is 7.2 and the pH for my K a2 is 7.12. The pH’s and the K a ’s are very similar meaning there was little error in the experiment. One thing that could account for these small differences could be that not exactly 1.0 mL was added each time to the acid every time making the pH at the equivalence point higher or lower than it is supposed to be. 4. How could you check that the decarbonation process was sufficient (did not affect your titration results) for the cola soft drink that you titrated?
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  • Fall '11
  • HeatherRankin
  • Chemistry, pH, Pk, Equivalence point, Equivalence, cherry cola

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