Postlab6 - Results 1) Are there any advantages to plotting...

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Results 1) Are there any advantages to plotting delta pH vs. mL of NaOH as opposed to plotting pH vs mL NaOH? Yes, the advantage is that you can easily see where the equivalence point is, where the change in pH is high, and where the buffer zones are, where the change in pH is the lowest. 2) How do your results compare with theoretical values for the pK’s and the equivalence points for this titration? Remember, both pK values and the pH at each equivalence point can be estimated graphically. For H3PO4 theoretically, pK(1)=2.16, pK(2)=7.16 and pH(1)=4.66, pH(2)= 6.49 Experimentally it was found that the pH of the first equivalence point was about 4.25 for both trials, which is only .41 off of the theoretical value for pH. The experimental pK value for H3PO4 was about 2.06 in both trials, found by finding the inflection point in the buffer zone. 2.06 is very close to the theoretical pK value of 2.16. For the pH at the second equivalence point was about 9.5 in trial 1 and about 9 in trial 2, these is much larger than the theoretical value of 6.49. The pK for H2PO4 was experimentally found to
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Postlab6 - Results 1) Are there any advantages to plotting...

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