Precipitation titration [local] is a quantitative volumetric technique. An example would be titration of a chloride sample with a silver nitrate solution of known concentration.

How is the end point detected in such a titration ?

The K_sp of Ag₂CrO₄ is 1.12 x 10^-12 and the The K_sp of AgCl is 1.76 x 10^-10. Silver chromate is more soluble than the silver chloride. This means that AgCl will form a precipitate before Ag₂CrO₄ does. If AgNO₃ is added to a beaker containing both CrO₄^2- and Cl^-, the Cl^- will form a precipitate first. When Cl^- ion has been sufficiently removed from solution, then Ag₂CrO₄ will precipitate.

Silver chloride is white; silver chromate is orange. The appearance of the orange precipitate signals the titration's end point.