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Dissolution enthalpies of uric acid and uric acid dihydrate

Wang, Z., Seidel, J., Wolf, G. and Königsberger, E.ORCID: 0000-0002-4606-0741 (2000) Dissolution enthalpies of uric acid and uric acid dihydrate. Thermochimica Acta, 354 (1-2). pp. 7-13.

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The dissolution enthalpies of uric acid and its dihydrate in Tris-buffer solutions were measured calorimetrically for the first time. It was found that these quantities do not depend significantly on pH (7.2-8.9), temperature (t=25-37°C), ionic strength (I=0.010-0.045 mol dm-3) and uric acid concentration (c=3.4-8.5 mmol dm-3). After subtracting the protonation enthalpy of Tris, the present results H2U(s) → H+(aq) + HU-(aq), Δ(r)H = (56.3 ± 0.4) kJ mol-1 H2U • 2H2O(s) → H+(aq) + HU-(aq) + 2H2O(aq), Δ(r)H = (64.5 ± 0.2) kJ mol-1 are consistent with those obtained from the temperature dependence of the solubility equilibrium constants reported in our previous work.

Item Type: Journal Article
Publisher: Elsevier BV
Copyright: 2000 Elsevier Science B.V.
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