Real properties

Recommended data for the real hydration parameters of the proton and the real partial molar variables of the aqueous proton (book Table 5.23). The reported data includes the real hydration free energy Δ_sĜ^ɵ[H_g⁺], the real hydration enthalpy Δ_sĤ^ɵ[H_g⁺] and the real hydration entropy Δ_sŜ^ɵ[H_g⁺] of the gas-phase proton, the real partial molar entropy ŝ^ɵ[H_aq⁺], the real partial molar heat capacity ĉ_P^ɵ[H_aq⁺], the real partial molar volume v^{^ɵ}[H_aq⁺], the real partial molar volume-compressibility k^{^}_T^ɵ[H_aq⁺] and the real partial molar volume-expansivity â_P^ɵ[H_aq⁺] of the aqueous proton, the real absolute electrode potential of the reference hydrogen electrode V^{^}_H,wat^ɵ and its temperature derivative ∂_TV^{^}_H,wat^ɵ, as well as the metal-solution Volta potential difference of the reference hydrogen electrode Δψ_H(Pt),wat^ɵ, assuming platinum Pt as metal. The standard states are according to the bbme_T convention (reference pressure P^ο=1 bar, reference molality b^ο=1 mol·kg^-1 and reference temperature T^-=298.15 K; standard state for the free electron according to the warm-electron convention: ideal-gas at temperature T^-, according to Fermi-Dirac statistics; Fermi-Dirac statistics is also applied for the gas-phase standard state of the proton). The solvation parameters and partial molar variables in solution are assumed here to pertain to the standard (Δ_sĜ^ɵ[H_g⁺], Δ_sĤ^ɵ[H_g⁺], Δ_sŜ^ɵ[H_g⁺], ŝ^ɵ[H_aq⁺], ĉ_P^ɵ[H_aq⁺]) or the density-corrected (v^{^ɵ*}[H_aq⁺], k^{^}_T^ɵ*[H_aq⁺], â_P^ɵ*[H_aq⁺]) variant, which represents the most likely situation, but may not necessarily be the case in reality. The real solvation free energy Δ_sĜ^ɵ[H_g⁺] is identical in the two variants.