Editing Solubility equilibrium (section)

=== Dynamic methods ===
Solubility values of organic acids, bases, and ampholytes of pharmaceutical interest may be obtained by a process called "Chasing equilibrium solubility".<ref>{{cite journal|last1=Stuart|first1=M.|last2=Box|first2=K. |year=2005|title=Chasing Equilibrium: Measuring the Intrinsic Solubility of Weak Acids and Bases|journal=Analytical Chemistry| pmid=15858976| volume=77| issue=4| pages=983–990|doi=10.1021/ac048767n}}</ref> In this procedure, a quantity of substance is first dissolved at a pH where it exists predominantly in its ionized form and then a precipitate of the neutral (un-ionized) species is formed by changing the pH. Subsequently, the rate of change of pH due to precipitation or dissolution is monitored and strong acid and base titrant are added to adjust the pH to discover the equilibrium conditions when the two rates are equal. The advantage of this method is that it is relatively fast as the quantity of precipitate formed is quite small. However, the performance of the method may be affected by the formation supersaturated solutions.