アルミニウム化合物の研究 (第7報)
塩基性塩化アルミニウム溶液の組成と塩基性硫酸アルミニウムの性状との関係
1957 年 77 巻 1 号 p. 45-50
詳細
1957 年 77 巻 1 号 p. 45-50
The properties of basic aluminum sulfate, formed by the combination of hydroxoaluminum ion and sulfate ion in the basic aluminum chloride solution, differs according to the degree of ionic condensation. The substances formed by combination with ions of greater degree of corsdensation are in globular form in the majority, generally possess smooth appearance, rapidly dissolve in dilute hydrochloric acid, and easily liberate the sulfate ion with alkali to form aluminum hydroxide. On the other hand, the substances formed by combination with ions of lower degree of condensation do not show such properties. Titration of basic aluminum sulfate in paste form with alkali showed that the pH curve does not show almost any jump but the solution obtained by separation of that paste does. Therefore, there is a great difference in the pH of a solution containing the paste and that of a solution separated from it. The pH of the solution, during the formation of basic aluminum sulfate in the solution, lowers irrespective of the manner of its preparation and n.
