Abstract

Abstract 1) The dilution effect on the pH change in a dilute solution and in the presence of sodium perchlorate was followed by a glass electrode. 2) A linear relationship is held between pH and −logC. The curves plotting pH vs. −logC run parallel with each other at varying ionic strengths, and the slope is nearly equal to 1/2 by which the most possible existence of Th(OH)+3 is pressumed. 3) The equilibrium constants for ion species, ThOH+3 and Th(OH)2+2, are calculated stoichiometrically from the data of hydronium ion concentration observed and the total concentration of thorium nitrate.

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