Table 5.15 Some organic precipitating agentsThe net result of the three factors discussed above is that frequently an optimum (minimum) solubility
is obtained when a small excess of the reagent is added. Figure 5.8 which is a solubility curve for AgCl
illustrates this pattern.
The effect of pH changes on precipitate solubilities merits special consideration. The dependence of
solubility on pH may derive from the common ion effect where OH– or H 3 O+ ions are generated by the
dissolution of the precipitate, e.g.