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Phase diagrams of PPG425+Na 2 SO 4 +H 2 O and PPG425+(NH 4 ) 2 SO 4 +H 2 O systems at 298.15K were measured. The densities and viscosities of two-phase systems were also measured. The improved regular solution theory was used to correlate the equilibrium data. In this theory a mixing entropy term and the Fowler-Guggenheim long-range electrostatic...
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