交流示波极谱滴定的研究(Ⅻ)——中和滴定

INVESTIGATIONS ON OSCILLOPOLAROGRAPHIC TITRATIONS(Ⅶ)ACID-BASE TITRATIONS

本文系统地报导了交流示波极谱滴定在中和滴定中的应用,解决了弱酸弱碱在水溶液中直接滴定等问题。同时提出了中和滴定的两大类指示剂的概念,并且总结了它们的性质。因此,示波极谱中和滴定将大大地丰富中和滴定的内容,扩大其应用范围。

A systematic study on the application of oscillopolarographic titrations to neutralization reactions was carried out with great success.Organic compounds,including ordinary acid-base indicators used in classical titrations,and metallic ions,such as Zn^(++),Pb^(++),Eu^(+++),In^(+++),Ga^(+++),can be usep as indicators whose oscillopolarograms show sharp incisions whose appearance and disappearance depend on the pH of the titrated solution.The oscillopolarographic titration can do many things which can not be done by the classical methods.Very weak acids,such as boric acid and phenol,can be titrated directly by standard bases using this new technique.The new method is more simple,accurate,rapid and much cheaper than the potentiometric titrations and the non-aqueous titrations used ordinarily in these cases.