Ni(Ⅱ)-NH_3-Cl^--H_2O体系中Ni(Ⅱ)配合平衡热力学

Thermodynamics of Ni(Ⅱ) complex equilibrium in system of Ni(Ⅱ)-NH_3-Cl^--H_2O

根据质量平衡和电荷平衡的双平衡法,研究Ni(Ⅱ)-NH3-Cl--H2O体系中Ni(Ⅱ)配合平衡热力学;求出氨水浓度和氯离子浓度在0～5 mol/L范围内变化时,体系的pH值、体系中总镍、游离氯离子、游离氨以及各种镍-氨配合物等的平衡浓度,绘制热力学平衡图,并对热力学计算结果进行试验验证和差异分析。研究结果表明:镍离子浓度理论计算值与试验值之间的相对误差绝对平均值为6.91%,这说明该热力学模型是正确的,所选数据的准确性较好。

Thermodynamics of Ni（Ⅱ ） complex equilibrium in the system of Ni（ Ⅱ）-NH3-CI^--H2O was studied by the double equilibrium method which was simultaneous equilibrium and aqueous electronic charge neutrality. Varying the concentration of ammonia and chloride ion, respectively, in range of 0-5 mol/L, pH value and the equilibrium concentration of total Ni, free CI^-, free NH3 and the complexes of （Ni（NH3））^2＋1-6 in the system were calculated, and thermodynamic diagrams were plotted. The relative errors between theoretic calculation and the experimental values of total concentration of nickel were analyzed. The results show that the relative average error is 6.91%. The critical data and the thermodynamic model are reliable.