化学学报 ›› 1965, Vol. 31 ›› Issue (2): 118-125. 上一篇    下一篇

论文

中性络合剂对强电解质溶液电导的影响——Ⅰ.阳离子酸1-C10H7NH3+及C6H5NH3+的电离常数的测定

刘为濤, 邓郁   

  1. 四川大学化学系
  • 收稿日期:1964-04-15 出版日期:1965-02-15 发布日期:2013-06-03

THE INFLUENCE OF A NEUTRAL COMPLEXING AGENT UPON THE CONDUCTIVITY OF A STRONG ELECTROLYTE SOLUTION Ⅰ. DETERMINATION OF DISSOCIATION CONSTANTS OF PROTONIC ACIDS, 1-C10H7NH3+ AND C6H5NH3+

LIU WEI-TAO, DEN Yu   

  1. Department of Chemistry, Szechuan University
  • Received:1964-04-15 Online:1965-02-15 Published:2013-06-03

在含成络离子的強电解貭溶液中,加入中性絡合剂,溶液的电导将随之而变.在強电解貭可以視为全部电离,阴离子不参与絡合作用的条件下,本文根据电解貭溶液的导电机理导出表达这种影响的定量方程式.从这基本方程式出发,在溶液中成絡阳离子的总浓度很小,从而各級絡离子的浓度都极为稀薄,∧0,∧1,∧2,…An等均可視为常数的条件下,根据中性絡合剂对強电解貭溶液电导的影响可测定絡合物的稳定常数.我們称此法为“电导函数法”.实驗怔明,在适当的体系中,应用电导函数法可测定絡合物的稳定常数.在本文的两体系中,利用电导函数法測得的稳定常数与文献值尚称符合.

On the basis of the classical conception of electrolytic conductance,we have derived the formula(8) which expresses the specific conductance of a solution,containing an electrolyte and a neutral complexing agent,as a function of the equivalent conductances of the complex compounds formed in solution.Since it has the same form as that of the Yatsimirskii's general formula,it could be considered as a special case of the latter. In order to verify the validity of the expression in question,we have undertaken the measurement of the specific conductances of two series of solutions,one containing hydrogen chloride and 1-naphthylamine,and the other,hydrogen chloride and aniline.The data so obtained were treated according to the above formula and gave the "pK"s of the two protonic acids formed in the solutions as 3.86 and 4.36 respectively.These figures are in fair agreement with those found by the E.M.F.method,which gave 3.92 and 4.58 respectively.