Stabilities of the silver complexes of imidazole and tri(hydroxymethyl)methylamine

The stability constants of the 1 : 1 and 2 : 1 ligand–silver complexes of imidazole and tri(hydroxymethyl)methylamine have been determined from pH measurements at a glass electrode over the range 0–50° and 0–60°, respectively, at 10° intervals. A computer program, based on Schwarzenbach, Willi, and Bach's method for the evaluation of equilibrium constants, has been developed and used in the calculations. The program includes a statistical procedure whereby the most consistent values of the constants are selected. Some aspects of the program are discussed. The thermodynamic quantities for the formation of the complexes, together with their probable errors, have been calculated from the temperature coefficients of the stability constants.