A Thermochemical Study of the Reaction of Lanthanum Nitrate with Alanine

摘要

The standard molar reaction enthalpy of the solid-solid coordination reaction La(NO3)3. 6H2O (s) +4Ala(s) (Ala is Alanine)=La(NO3)3·(Ala)4·H2O(s) + 5H2O(1) was studied by using classical solution calorimetry. The molar dissolution enthalpies of the reactants and the product of the solid-solid coordination reaction in 2 mol/L HCl were measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpy of [La (NO3)3·(Ala)4·H2O, s, 298. 15 K] has been determined to be △fHm[La(NO3)3·(Ala)4·H2O, s, 298. 15 K]=-3 864. 248 kJ/mol.