Non-logarithmic distribution diagrams

The construction of non-logarithmic distribution diagrams is based on the equation of analytical concentrations and equations for the corresponding equilibrium constants. In the case of the reaction MA M + A with an equilibrium constant K it is necessary to take into consideration two components, i.e. MA and M, whose concentrations depend on the concentration of the predominant species A. When solving the two equations the following relations are obtained  

Non-logarithmic distribution diagram with 3 species at different ratio of equilibrium constants. Curves 1, 2 and 3 are for the ratio Ki A 2 = 2.5, 10 and 100 

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Non-logarithmic distribution diagrams — due to their clear representation — are used for orientation search for significant and negligible species in the system in question (particularly the solution of the complex-forming equilibria). 

Fig. 3.18. Non-logarithmic distribution diagram of a system of mercury chloro complexes Hg +, HgCl+, HgCl2, HgCIj, HgClJ-...

One of the most important aspects of hydrochemistry is the determination of the relative representation of the particular components of a protolytic equilibrium involving distribution coefficients 6. Graphical illustration of the relationship S = /(pH) can be expressed by either non-logarithmic or logarithmic distribution diagrams. Using these diagrams it is possible to read off the values of the concentrations of the particular species. 

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