f i = »¡(Tploiv'*3'+ / ^ dp + R T ln (x{ y{) (4.6)

where the reference chemical potential is a function of the composition of phase j, in the case of infinitely diluted component i, denoted as xJ,i" here. The vapor pressure of that mixture at temperature T is psolv.

Relations similar to equation (4.6) are used for electrolytes (A+)v+ (B~)„_ in solution

n\ = Mf(T,p,xJ' ) + R T ln i i j + R T ln (yf) (4.7)

Note that, in principle, there is a free choice to apply any of the equations (4.4)—(4.8) to any component in any phase. The only condition that has to be fulfilled is the Gibbs-Duhem equation for each phase, which reads at constant temperature and pressure

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