Chapter 3, Problem 87SCQ

Most naturally occurring acids are weak acids. Lactic acid is one example.

${\text{CH}}_{\text{3}}{\text{CH(OH)CO}}_{\text{2}}{\text{H(s) + H}}_{\text{2}}\text{O(}\mathcal{l}\text{)}\rightleftarrows {\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\text{(aq) + }{\text{CH}}_{\text{3}}{\text{CH(OH)CO}}_{\text{2}}-\text{(aq)}$

If you place some lactic acid in water, it will ionize to a small extent, and an equilibrium will be established. Suggest some experiments to prow that this is a weak acid and that the establishment of equilibrium is a reversible process.