6533b854fe1ef96bd12adfe6

RESEARCH PRODUCT

Hydrolysis of dioxouranium(VI): a calorimetric study in NaClaq and NaClO4aq, at 25°C

Francesco CreaSilvio SammartanoConcetta De StefanoAlberto Pettignano

subject

Aqueous solutionChemistryIonic strength dependenceEnthalpyInorganic chemistryIonic bondingCalorimetryCalorimetryCondensed Matter PhysicsSodium perchlorateUranylchemistry.chemical_compoundHydrolysisReaction enthalpyIonic strengthPhysical chemistrySettore CHIM/01 - Chimica AnaliticaPhysical and Theoretical ChemistryHydrolysis of UO22+Instrumentation

description

Abstract We report the results of a calorimetric study on the hydrolysis of UO 2 2+ in different ionic media (NaClO 4 aq , NaCl aq ) at 25 °C. Experiments in NaCl were performed at different ionic strength, at I ≤1 mol l −1 . The species considered in both ionic media were UO 2 (OH) + , (UO 2 ) 2 (OH) 2 2+ and (UO 2 ) 3 (OH) 5 + , and in addition (UO 2 ) 3 (OH) 4 2+ and (UO 2 ) 3 (OH) 7 − in NaCl aq . The dependence on ionic strength of enthalpy changes in NaCl aq was expressed by the simple linear equation Δ H pq =Δ H ° pq + aI 1/2 ( a , empirical parameter). Comparison with literature findings is given and some recommended values are reported.

yearjournalcountryeditionlanguage
2004-05-01Thermochimica Acta
https://doi.org/10.1016/j.tca.2003.12.018