Ascorbic acid is one of the essential compounds for living organisms. The reductive properties of ascorbate depend significantly on the dissociation of ascorbic acid, which, in turn, is influenced by the ionic strength value. The protonation of ascorbate dianion was studied in an aqueous solution at T = 298.2 K; p = 0.1 MPa; and I = 0.10, 0.25, 0.5, 1.0, 2.0, 3.0, and 5.0 mol L–1 (NaCl) using the spectropotentiometric technique. Protonation constants were calculated from the spectral data. The analysis of ionic strength influence on the ascorbic acid dissociation constants was performed using the modified Davies equation (the so-called Vasil’ev equation) and specific ion interaction theory.

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