In this lesson our instructor talks about applications of aqueous equilibrium. First, he discusses calculating pH of an acid-base mixture. Then he talks about buffers, buffers preparation and capacity. He also lectures on acid-base titrations, solubility equilibria, and complexation equilibria. He ends the lecture with a summary and one helpful sample problem. Applications of Aqueous Equilibria Equilibrium can be applied to various systems, including acid-base mixtures, buffers, titrations, solubility, and complex ion formation. The Henderson-Hasselbalch equation can be used to approximate the pH of a buffer system. Titration curves monitor pH versus volume of titrant added. Solubility product constants quantify the extent to which an ionic solid is soluble in water.