Abstract

The stability constants of Cu(SCN)+ in the titled system have been determined by spectro-photometric measurements at 25°C for 0, 5, 10, 15, 20 and 25 wt% of ethyl alcohol in mixed solvents. The total ionic strength of the solution are 0.2-2.0 mol·dm−3 and pH 1.5-1.6. On basis of Pitzer's theory, a method of determining thermodynamic stability constants of coordination compounds in mixed solvents by curve fitting technique have been proposed. The stability constants of Cu(SCN)+ in mixed solvents have been correlated with composition and dielectric constant of the solvent mixture.

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