Example iii.1. Experimental osmotic coefficients, f₁, plotted against molality of the studied binary mixtures (r) 1-propanol, (▲) 2-propanol, (□) 1-butanol, (■) 2-butanol, and (Ñ) 1-pentanol with MMpyMSO₄ at   T = 323.15 K. Solid line (¾): extended Pitzer model of Archer, long-dashed line (¾  ¾): MNRTL model.