Standard molar volumes and heat capacities of aqueous solutions of trifluoromethanesulfonic acid at temperatures up to 573 K and pressures to 30 MPa

Emilie Pourtier (1) , Karine Ballerat-Busserolles (2) , Vladimir Majer (2)

1 G2R - Géologie et gestion des ressources minérales et énergétiques
2 TSP - Thermodynamique des solutions et des polymères

Densities and heat capacities of dilute aqueous solutions (0,025 to 0,4 mol.kg-1) of trifluoromethane sulfonic acid (triflic acid) were measured with original high temperature / high pressure instruments at temperatures and pressures up to 574 K and 31 MPa, respectively. Standard molar volumes and standard molar heat capacities were obtained via extrapolation of the apparent molar properties to infinite dilution. The evolution of these standard derivative properties of the triflic acid with temperature and pressure is qualitatively compared with that of other acids of different strengths.

Mots clés: Density; heat capacity; apparent molar volume; apparent molar heat capacity; standard molar volume; standard molar heat capacity; trifluoromethane sulfonic acid; triflic acid; dilute solution

Domaines: Chimie théorique et/ou physique

Emilie Pourtier, Karine Ballerat-Busserolles, Vladimir Majer. Standard molar volumes and heat capacities of aqueous solutions of trifluoromethanesulfonic acid at temperatures up to 573 K and pressures to 30 MPa. Journal of Solution Chemistry, 2009, 38 (5), pp.601-618. ⟨10.1007/s10953-009-9389-0⟩. ⟨hal-00344497⟩