Setchenow equation

The decrease in the solubility of H2S with the addition of salt or the salting out can be represented by the Setchenow equation... 

Setchenow salting-out and van t Hoff equations equations used to describe the effects of temperature and salinity on the solubility of gases in seawater. 

Activity coefficients for uncharged, molecular species generally obey the empirical Setchenow equation up to high ionic strengths (cf, Lewis and Randall 1961 Miller and Schreiber 1982). Such species include dissolved gases, weak acids, and molecular organic species. The Setchenow equation is... 

Einstein-Schmolukowski, 378, 405 Gibbs-Duhem, 262 LaPlace, 392 Leonard-Jones, 45 Nernst-Einstein, 456 Nernst Planck, 476 Onsager, 494 Planck-Henderson, 500 Poisson, 235, 344 Poisson-Boltzmann, 239 Sackur-Tetrode equation, 128 Setchenow s, 172 Tafel, 2... 

This work and others (5, 51) have shown how the Pitzer model, together with appropriate Henry s law constants, can be used to calculate the solubility of volatile strong electrolytes in multicomponent solutions. The treatment of NH3 summarized above shows that Pitzer formalism can also be used to describe the solubility of weak and non-electrolytes. We have noted how, for low concentrations of NH3, the Pitzer equations reduce to a series of binary interaction terms similar in form to those of the well known Setchenow equations. However, the thermodynamically based approach constitutes a significant improvement over the use of purely empirical equations to predict individual thermodynamic properties because it is equally applicable to both electrolytes and uncharged species, and provides a unified description of a number of important solution properties. 

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