A general program constructing logarithmic concentration diagram (LCD) allows to estimate quickly equilibrium components of any complexation systems. In the simple system only consisting of complex formation between metal ion with ligand, the equilibrium concentration of components estimated from LCD is in good agreement with those obtained by other calculation methods. Conversely, in the complicated systems consisting auxiliary process (the hydrolysis of metal on, the protonization of base ligand), the results obtained from LCD with using the conditional equilibrium constants are satisfactory. This program is written by Turbo Pascal.
