Chapter 8, Problem 74E

What is an acid—base indicator? Define the equivalence (stoichiometric) point and the endpoint of a titration. Why should you choose an indicator so that the two points coincide? Do the $\text{pH}$ values of the two points have to be within $\pm 0.01$ $\text{pH}$ unit of each other? Explain. Why does an indicator change from its acid color to its base color over a range of $\text{pH}$ values? In general, when do color changes start to occur for indicators? Can the indicator thymol blue contain only a single
${\text{—CO}}_2\text{H}$ group and no other acidic or basic functional group? Explain.