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Dissolution enthalpies of uric acid and uric acid dihydrate
Journal article   Peer reviewed

Dissolution enthalpies of uric acid and uric acid dihydrate

Z. Wang, J. Seidel, G. Wolf and E. Königsberger
Thermochimica Acta, Vol.354(1-2), pp.7-13
2000
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Abstract

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.

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Citation topics
1 Clinical & Life Sciences
1.243 Kidney Diseases
1.243.519 Urolithiasis
Web Of Science research areas
Chemistry, Analytical
Chemistry, Physical
Thermodynamics
ESI research areas
Chemistry
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