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本文在改进了Schwarzenba。11和Reifies等所用实励方法的基础[’].P,进一步用汞电极电位法测求La、Ce、Pr、Nd. Sin等效希土的EDTA资合物的稳定常数,鼓果显夫3。实险条件:t—15、20、25、30、3510.1”C,0—0.1,参比电极是0.INI AgrAgCI电极。溶液的祖份激度是0.001M Ln*一十0.001M*文*”+0.001M Ln’”。从不同温度的稳定常数,求算各赘合物在25”C时7N成的热力学函数」F、JH和朋(表4)。由于计算上的需要,本文亦测定了Hg(11)-EDTA资合物在各温度和离xgE度等条件相同下的稳定常数(表2),用PH电位满定u求EDTA在各温度时的酸离解常数(表1),并算得有关的热力学函数(25”C)。实股证明gHg电位法不仅方法简单、迅速及准确,对温度的变化亦具有一定的敏感性,适用的温度亦较广,在一定范围内可以用它同接测定反应的热力学函数。
This article has been improved Schwarzenba. 11 and Reifies and so on. [P], the stability constants of EDTA compounds of La, Ce, Pr, Nd, Sin and other equivalent rare earths were further determined by the mercury electrode potential method. 3. Real risk conditions: t-15,20,25,30,3510.1 “C, 0-0.1, the reference electrode is 0.INI AgrAgCI electrode solution ancestral extremum excitement is 0.001M Ln * a ten 0.001M * text * ”+0.001 M Ln ’“ From the stability constants at different temperatures, calculate the thermodynamic functions of the 7N at 25 ”C for each compound. Due to the computational requirement, we also determined the stability constants of Hg (11) -EDTA at the same temperature and xgE (Table 2) Of the acid dissociation constant (Table 1), and calculate the relevant thermodynamic function (25 "C) .Should prove gHg potential method is not only simple, rapid and accurate method, the temperature changes also have a certain sensitivity, the applicable temperature Wider, in a certain range can be used to measure the reaction with the thermodynamic function.