Abstract
Protonation constants of oxalate (ox 2-) were obtained, by potentiometric measurements, in NaCl, KCl and tetraethylammonium iodide aqueous solutions in the ranges 5 ⩽ T ⩽ 50°C and 0 ⩽ I ⩽ 1 mol dm −3. The differences in protonation constant values were explained by a complex formation model assuming the formation of M(ox) − and MH(ox) 0 (M = Na + K +) complexes. From the dependence on temperature of the protonation and formation constants, Δ H° values were calculated. The dependence on ionic strength of the formation thermodynamic parameters was obtained for each species. Consideration is given to the use of different concentration scales, and comparison is made with literature findings. Recommended values are given. Simulated protonation constants in sea water conditions are reported.
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