Theory of titration curves: Locations of points of maximum slope on potentiometric heterovalent (“asymmetrical”) precipitation titration curves

摘要: By a wholly rigorous general treatment of the potentiometric titration curve representing Bm+ with An- to give precipitate BnAm, where n ≠ m, it is shown on taking into account effect dilution that: (1) If nm > 1, inflection point must precede equivalence point, but there no if initial concentration ion titrated smaller than certain value, which determined by values n, and solubility product precipitate. (2) < may follow — though not more definite amount or coincide it. In every such case that will cause an point; this depends (3) Unless difference between points negligibly small, traditional in neglected gives seriously erroneous estimates location point.