Abstract
The solubility of silver chloride has been measured in sodium chloride solutions of 5×10 −5 − 3.0 m over the temperature range from 100 to 353°C at the saturated vapour pressure of the system. The solubility product and the cumulative and stepwise formation constants have been calculated from the solubility data. With increasing temperature, there is a trend towards chlorosilver (I) complexes of low coordination number and charge. At T > 270° C, the species of maximum ligand number in concentrated solutions up to 3.0m sodium chloride, is the dichlorosilver (I) complex, AgCl 2. In addition, large endothermic enthalpies and large positive entropies, similar to those found for hardhard interactions at low temperature, accompany complex formation at elevated temperatures. It is concluded that chlorosilver (I) complexes play an important role in the transport and deposition of silver from hydrothermal ore solutions.
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