The chemical behaviour of salts in complex hydrothermal fluids is not well understood over most of the P-T conditions of geochemical interest. This study of the behaviour of electrolyte components in complex fluid mixtures over a range of pressures and temperatures is designed to help to decipher the physico-chemical conditions of natural hydrothermal processes. The information is also necessary to test and develop new equations of state for hydrothermal fluids.Specifically, we have explored the variation in the concentration of dissolved components with the composition of the host solution, at fixed component activity. In this context, highly soluble substances such as chloride salts present experimental problems. Investigations of the relative behaviour of pairs of components whose activity ratio can be fixed, prove the simplest experimentally. An example of this is exchange equilibria of the type:
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