Intrinsic properties

Recommended data for the intrinsic hydration parameters of the proton and the intrinsic partial molar variables of the aqueous proton (book Table 5.24). The reported data includes the intrinsic hydration free energy Δ_sG^ɵ[H_g⁺], the intrinsic hydration enthalpy Δ_sH^ɵ[H_g⁺] and the intrinsic hydration entropy Δ_sS^ɵ[H_g⁺] of the gas-phase proton, the intrinsic partial molar entropy s^ɵ[H_aq⁺], the intrinsic partial molar heat capacity c_P^ɵ[H_aq⁺], the intrinsic partial molar volume v^ɵ[H_aq⁺], the intrinsic partial molar volume-compressibility k_T^ɵ[H_aq⁺] and the intrinsic partial molar volume-expansivity a_P^ɵ[H_aq⁺] of the aqueous proton, the intrinsic absolute electrode potential of the reference hydrogen electrode V_H,wat^ɵ and its temperature derivative ∂_TV_H,wat^ɵ, as well as the air-liquid interfacial potential jump of pure water χ_wat^ɵ and its temperature derivative ∂_Tχ_wat^ɵ. 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_sG^ɵ[H_g⁺], Δ_sH^ɵ[H_g⁺], Δ_sS^ɵ[H_g⁺], s^ɵ[H_aq⁺], c_P^ɵ[H_aq⁺]) or the density-corrected (v^ɵ*[H_aq⁺], k_T^ɵ*[H_aq⁺], a_P^ɵ*[H_aq⁺]) variant, which represents the most likely situation, but may not necessarily be the case in reality. The intrinsic solvation free energy Δ_sG^ɵ[H_g⁺] is identical in the two variants. Note that the data in this table corresponds to experimentally-elusive properties and has therefore to be considered with some caution (i.e. it is implicitly bound to a specific extra-thermodynamic assumption).