Isopiestic Measurement of the Osmotic Coefficients of Aqueous {XH2SO4 + (1-X)Fe2(SO4)3} Solutions at 298.15 and 323.15K

This study measures the osmotic coefficients of {l_brace}xH{sub 2}SO{sub 4} + (1-x)Fe{sub 2}(SO{sub 4}){sub 3}{r_brace}(aq) solutions at 298.15 and 323.15 K that have ionic strengths as great as 19.3 mol {center_dot} kg{sup -1}, using the isopiestic method. Experiments utilized both aqueous NaCl and H{sub 2}SO{sub 4} as reference solutions. Equilibrium values of the osmotic coefficient obtained using the two different reference solutions were in satisfactory internal agreement. The solutions follow generally the Zdanovskii empirical linear relationship and yield values of a{sub w} for the Fe{sub 2}(SO{sub 4}){sub 3}-H{sub 2}O binary system at 298.15 K that are in good agreement with recent work and are consistent with other M{sub 2}(SO{sub 4}){sub 3}-H{sub 2}O binary systems.