The solution chemistry of the copper (II) - ammonia thiosulfate aqueous system

The paper presents a new thermodynamic approach to studying mixed ligand
complex formation reactions in multicomponent two-phase systems “solid phase saturated aqueous solution” under real conditions.
The quintessence of developed approach consists in the thermodynamic analysis of
concurrent reactions in the system Cu (II)-NH3-S2O32--H2O under real conditions on
the basis of the introduced notion of the generalized reaction equation. The
formation of mixed ligand complex species Cu(OH) i (NH3 ) j (S2O3 ) k is
characterized by certain peculiarities in the behavior of studied two-phase
heterogeneous systems. The new feature is to focus on the chemical description of
the overall process of complex formation consisting of a series of concurrent
reactions, where the nature and ratio of the concentrations of chemical species,
formed in such reactions, depend on the ratio of the concentrations of the metal Cu2+
and ligands, temperature and other factors (thermodynamic parameters).