The Apparent Molal Volumes of Aqueous Solutions of NaCl, KCl, MgCl₂, Na₂SO₄, and MgSO₄ from 0 to 1000 Bars at 0, 25, and 50°C

The densities of aqueous solutions of NaCl, KCl, MgCl₂, Na₂SO₄, and MgSO₄ have been measured with a high pressure magnetic float densimeter from 0 to 1000 bars, 0.01 to 1.0 m ionic strength, and at 0, 25, and 50 °C. The relative apparent molal volumes, ϕ_v(P) ‒ ϕ_v(0), of these solutions have been fitted to an equation of the form ϕ_v(P) ‒ ϕ_v(0) = ϕ_v°(P) ‒ ϕ_v°(0) + Sm^½ where the relative infinite dilution partial molal volumes, ϕ_v°(P) ‒ ϕ_v°(0), and the slopes S are functions of applied pressure and temperature. The pressure, temperature, and concentration dependence of the apparent molal volumes are briefly discussed.