It is an inverted osmotic separation device that obtains pure water from an aqueous electrolyte solution through a semipermeable membrane. When pure water is exposed to 1 atm and the mole fraction of the solute in the electrolyte aqueous solution is 0.009 at 300K, the pressure P[atm] of the solution in which osmotic equilibrium is formed is 18 cm3mol-1 and the gas constant R is 82 cm3 atmmol-1K-1, and the solute molecule is completely dissociated from the aqueous solution to two ions.

Figure shows an inverted osmotic separation device that obtains pure water from an aqueous electrolyte solution through a semipermeable membrane. When pure water is exposed to 1 atm and the mole fraction of the solute in the electrolyte aqueous solution is 0.009 at 300K , the pressure P[atm) of the solution in which osmotic equilibrium is achieved is 18 Culund , the gas constant Ris 82 cms atm kual. K , and the solute molecule is completely dissociated from the aqueous solution to two ions. sempermeable P latm An aqueous electrolyte Pure water. solution