Ce(TCA)_3·3H_2O(s)的标准生成热

The Standard Molar Formation Enthalpy of Ce(TCA)_3·3H_2O(s)

为深入研究三氯醋酸铈配合物,很有必要认识其基本热力学性质。用溶解量热法,在自行研制的具有恒定温度环境的新型反应量热计中,测定CeCl3·7H2O(s) 、CCl3COOH(s)和 Ce(TCA)3·3H2O(s)在1mol/L HCl中的溶解焓。根据盖斯定律设计一个热化学循环,得到七水合氯化铈与三氯醋酸反应的反应焓DrHmq (298.15K)= 204.279kJ/mol,并求出了Ce(TCA)3·3H2O(s)的标准生成焓DfHmq [Ce(TCA)3·3H2O,s,298.15K]=-3060.0 kJ/mol。

In order to make a deep research on cerium trichloroacetic acid, it is necessary to know its basic thermodynamics property. The standard molar reaction enthalpy of the reaction , CeCl3·7H2O(s) +3CCl3COOH(s)( TCA) = Ce(TCA)3?H2O(s) +3HCl(g) +4H2O(l) has been studied by the classical solution calorimetry . The molar dissolution enthalpies of the reactants and the products of the reactions in certain solvent in 1 mol/L HCl have been measured by using an isoperibol calorimeter. From the results and other auxiliary quantities , the standard molar formation enthalpy of [Ce(TCA)3·3H2O,s,298.15K] has been determined to be DfHmq[Ce (TCA)3·3H2O,s,298.15K]= -3060.0 kJ/mol .