【摘要】 通过对弱酸难溶盐平衡体系的讨论，导出了弱酸离解常数、金属离子浓度和溶液ｐＨ值之间的关系，从而给出一种利用金属离子选择电极测定弱酸离解常数的方法。采用该法，本文用钙离子选择电极对Ｈ２ＣＯ３、Ｈ２Ｃ２Ｏ４和ＨＦ的离解常数进行了测定，得到与文献值相一致的结果（Ｈ２ＣＯ３∶ｐＫ１＝６．５３，ｐＫ２＝１０．２５；Ｈ２Ｃ２Ｏ４∶ｐＫ１＝１．３２，ｐＫ２＝４．２４；ＨＦ∶ｐＫ＝３．０８）。同时本法还可以用来测定相应的溶度积常数。更多还原

【Abstract】 correlation formula between the ionization constant of a weak acid,the concentration of metal ion and the pH value of solution was deduced by studying the equilibrium system of on in soluble salt of the weak acid ,and a method of determination of the ionination constant of the weak acid was developed by using metal ion selective electrode.By this method the ionization conatants of H2CO3,H2C2O4 and HF were determined with a calcium ion selective electrode,the values obtained accord with those in the references (H2CO3:pK1=653,pK2=1025;H2C2O4:pK1=132,pK2=424;HF:pK=308).This method can also be used to determine the corresponding solubility constants.更多还原