Fig. 8. Influence of the activity coefficient on the solubility in molality in water expressed as difference between ideal and experimental solubility. Black (Ideal): calculated solubility at T = 298.15 K from eqn (1) based on the FSC-measured melting properties in experimental uncertainty assuming an ideal mixture γ = 1. Shaded (Exp.): mean value of the photometric and gravimetric determined solubility data at T = 298.15 K and pH = 7. Grey (PC-SAFT): calculated solubility at T = 298.15 K from eqn (1) based on the PC-SAFT used melting properties from Table 4 including the activity coefficient.