Question

Consider the titration of 100.0 mL of 0.10 M phosphoric acid with 0.10 M NaOH.
a. Determine the pH at the third half- equivalence point by assuming it is a “special point” (see Fig.).
b. Calculate the pH at the third equivalence point.
c. Why must the answer to part a be incorrect? Why can’t we use the “special point” on the graph? (Explain the assumption made in using the special point and why it is not valid in this case.)
d. Calculate the pH at the third half-equivalence point.
Figure


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  • CreatedMay 05, 2015
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