Abstract

A method with a low-crosslinked anion exchange resin for determining the charge number of a complex ion has been proposed. By the use of this type of resin, the charge analysis may easily be done under reasonable assumptions, because the experimental conditions where the concentration of ligand or the ionic strength is considered to be similar for the solution and the resin phase can be attained over a considerably wide region. In addition, a method for the determination of the polymerization number of a complex ion using the same resin has also been proposed. In this method an anion indifferent for the complex formation has been added to the distribution system in order to make the equilibrium analysis easy. These methods have been applied to the aluminum-hydroxo complex system. It has been presumed that the most of aluminate ions are present always in a monocharged and mononuclear form Al(OH) 4 − in ∼ 1 M sodium hydroxide solutions, although these species tend to precipitate gradually.

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