Continuous variation data: 1:1 or 2:2 weak complexes?

An attempt to distinguish between 1:1 and 2: 2 weak complexes from continuous variation data is given. A modification of the Heller and Schwarzenbach's method which involves the use of the absorbance ratio y = A/Alim (once the limiting absorbance, Alim is known) may be applied to 1:1 weak complexes. This allows checking if the slope obtained is close to the theoretical value of −0.25. A curvature appears and the residuals have a pattern when a wrong 1: 1 model is selected for a true 2:2 stoichiometry.