山形懸産酸性白土の研究(第1報)呈酸性反応の速度と平衡

概要

論文の詳細を見る
The rates of pH-change of some neutral salt solutions, mixed with the acid clay, were measured, at 5O℃ and 100℃, under the same condition of stirring, by both the electric and colorimetric methods. The neutral salt used were the sulphates of sodium and potassium, and the chlorides of potassium and barium, their concentrations (C) being 0.1, 0.2, 0.3 and 0.4 N.　The following results were obtained. (1) At the equilibrium, the isothermal [H+]-[H+]_0=kc^n holds good, where [H+] is the epuilibrium concentration of hydrogen ion, [H+]_0, its initial values and k and n are constants depending on the natures of materials and the temperature. (2) This formula reminds of the Freundlich's sorption isothermal and suggests that [H+]-[H+]_0 is equivalent to the amount of cation of neutral salt which is sorped by the clay. (3) The heats of activation under the same conditions were 17-18 Cals per mol for sulphates and 8-9 for chlorides. From these values it may be suggested that the rate determining step for the total pH-change reaction is not the diffusion of cations of the neutral salts, nor the dissolution of the Al-ion in the clay, but the change of chemical linkago.
山形大学の論文
1951-10-01