X-based and m-based activity coefficients in the solver

Conversion of Activity Coefficient from molal basis to mole fraction basis The conversion from the activity coefficient in molal basis (i.e. unsymetric) to mole fraction basis (i.e. symmetric) is the following: γ_(K^+)^(m,∞)=x_w^x∙γ_(K^+)^(x,∞)

On the molality basis, the activity coefficient of water is not defined (it is defined for all components except water). This is because the definition of molality, which refers everything to 1 kg of water. For all other components, we report the activity coefficients. Therefore, we report directly the activity of water in the γ–m-based column. On the mole fraction scale, there are no such exceptions because water is then treated as any other component and the γ–x-based column shows activity coefficients for all species, including water. So, x_w^x∙γ_(K^+)^x=a_(K^+)^x=a_(K^+)^m