Thermodynamic properties of aqueous electrolyte solutions. Volumetric and compressibility studies in 0.1 mol · kg^-1, 0.5 mol · kg^-1, and 1.0 mol · kg^-1 sodium carbonate and sodium sulfate solutions at temperatures from 278.15 K to 323.15 K

Densities and sound velocities in 0.1 mol · kg^-1, 0.5 mol · kg^-1, and 1.0 mol · kg^-1 sodium carbonate and sodium sulfate solutions were determined at 1 K temperature intervals in the 278.15 K to 323.15 K range. Measured quantities were expressed as polynomials of temperature, and these polynomials were used to evaluate the apparent molar volumes V₂, φ(T, m), the isobaric thermal expansibilities α(T, m), the product of temperature and the second-order derivatives of volume with respect to temperature T(∂²V/ ∂T²)_{P, m} (changes in isobaric heat capacities with respect to pressure -(∂C_p/∂P)_{T, m}), the isentropic compressibilities κ_s(T, m), the isothermal compressibilities ∂_T(T, m), the apparent molar compressibilities K₂, φ(T, m), the isochoric thermal pressure coefficients (∂P/∂T)_{V, m}, the change of cubic expansion coefficients with pressure at constant temperature (∂α/∂P)_{T, m}, and the second-order derivatives of pressure with respect to temperature T(∂²P/ ∂T²)V, m (changes in isochoric heat capacities with respect to volume (∂C_V/∂V) _{T, m}).