THE LINEAR ISOPIESTIC RELATIONS FOR THE SATURATED SYSTEM (B-C-D-A(2(SAT))-A(1)) WHOSE SUBSYSTEM (B-C-D-A(1)) CONFORMS TO THE ZDANOVSKII RULE AND THE STOKES-ROBINSON RELATION

Isopiestic measurements have been made for the systems mannitol-sorbit ol-BaCl2. 2H(2)O((sat))-H2O, mannitol-sorbitol-K2SO4(sat)-H2O, mannito l-sorbitol-MgSO4. 7H(2)O((sat))-H2O, mannitol-sucrose-BaCl2. 2H(2)O((s at))-H2O, mannitol-sucrose-K2SO4(sat)-H2O, mannitol-sucrose-MgSO4. 7H( 2)O((sat))-H2O, and sucrose-urea-NaCl(sat)-H2O at 298.15 K. The linear isopiestic relations for the saturated systems have been derived and compared with the present isopiestic measurements and those reported p reviously. For the new linear isopiestic relations to hold, the corres ponding unsaturated subsystem (B-C-D-A(1)) must conform to the Zdanovs ki rule and the Stokes-Robinson linear isopiestic relation. Under this condition, the saturated system (B-C-D-A(2(sat))-A(1)) conforms to th e new linear relations, irrespective of whether A(2) is a non-electrol yte or an electrolyte, a symmetrical electrolyte or an unsymmetrical e lectrolyte.