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Department of Earth and Atmospheric Sciences: Faculty Publications
Oxalic acid; ethanedioic acid; dissociation constants; thermodynamics; potentiometry; ionic strength.
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Dissociation Quotients Of Oxalic Acid In Aqueous Sodium Chloride Media To 175c, Richard Kettler, Donald A. Palmer, David J. Wesolowski
Dissociation Quotients Of Oxalic Acid In Aqueous Sodium Chloride Media To 175c, Richard Kettler, Donald A. Palmer, David J. Wesolowski
Department of Earth and Atmospheric Sciences: Faculty Publications
The first and second molal dissociation quotienls of oxalic acid were measured potenliometrically in a concentration cell filled with hydrogen electrodes. The emf of oxalic acid-bioxalate solutions was measured relative to an HCI standard solution from 25 to 125°C over 25° intervals at nine ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and available literature data were treated in the all anionic form by a five-term equation that yielded the following thermodynamic quantities at infinite dilution and 25°C: logKIa = -1.277±0.010, ΔHl̊a = -4.1± 1.1 kJ-mol-1, ΔSl̊a = 38±4 J-K …