Chapter 8, Problem 160AE

Consider the following two acids:

In two separate experiments, the $\text{pH}$ was measured during the titration of $\text{5}\text{.00 mmol}$ of each acid with $\text{0}\text{.200 M NaOH}$ . Each experiment showed only one stoichiometric point when the data were plotted. In one experiment the stoichiometric point was at $\text{25}\text{.00 mL}$ added $\text{NaOH}$ , and in the other experiment the stoichiometric point was at $\text{50}\text{.00 mL}$ $\text{NaOH}$ . Explain these results. (See $\text{Exercise 85}$ .)