Conductivity studies of dilute aqueous solutions of oxalic acid and neutral oxalates of sodium, potassium, cesium, and ammonium from 5 to 35 degrees C

摘要

Conductivity measurements of oxalic acid and neutral oxalates (disodium oxalate, dipotassium oxalate, dicesium, and diammonium oxalate) were performed on dilute aqueous solutions, c < 3 x 10(-3) mol-dm(-3), from 5 to 35&DEG;C, These-data and those available from the literature were analyzed in terms of dissociation steps of oxalic acid, the Onsager conductivity equation for neutral oxalates, the Quint-Viallard conductivity equation for the acid, and the Debye-Huckel equation for activity coefficients, to give the limiting equivalent conductances of bioxalate anion λ(&INFIN;)(HC2O4-) and oxalate anion lambda(infinity)(1/2C(2)O(4)(2-)) and the corresponding dissociation constants K-1 and K-2. [References: 63]