Isopiestic Investigation of the Systems Fe2(SO4)3–H2SO4–H2O, FeCl3–H2O, and Fe(III)–(Na, K, Mg, Ca)Cl n –H2O at 298.15 K

Isopiestic measurements were performed in binary and ternary systems of the type Fe2(SO4)3–H2SO4–H2O, FeCl3–H2O, and FeCl3–MCl n –H2O (M = Na, K, Mg, or Ca). Numeric data for water isoactivity lines are presented and osmotic coefficients are calculated. The obtained data were recalculated using Pitzer’s equations. Pertinent parameters are given.